PORTABLE TRAFFIC MONITORING SITE INSTALLATION AND INSPECTION TRAINING

PORTABLE TRAFFIC PORTABLE TRAFFIC MONITORING SITE MONITORING SITE INSTALLATION AND INSTALLATION AND

INSPECTION TRAININGINSPECTION TRAINING

PRESENTED BY:PRESENTED BY:FLORIDA DEPARTMENT OF FLORIDA DEPARTMENT OF

TRANSPORTATION AND SOUTHERN TRANSPORTATION AND SOUTHERN TRAFFIC SERVICESTRAFFIC SERVICES

RUBIE FRASE & TERRY ROBINSONRUBIE FRASE & TERRY ROBINSON

THE IMPORTANCE THE IMPORTANCE OF DATA OF DATA

COLLECTINGCOLLECTING• The State Road Department

started collecting traffic data at ten locations back in 1936. As the state grew both in population and number of lane miles, the need to expand traffic data collection was obvious.


COLLECTINGCOLLECTING

• The value of good traffic data became apparent early on in the evolution of the national Department of Transportation (DOT) and eventually the Federal Highway Administration (FHWA).


COLLECTINGCOLLECTING• This data is translated into revenue allocations for the state and federal highway programs.

THE IMPORTANCE OF THE IMPORTANCE OF DATA COLLECTINGDATA COLLECTING

Good data is a result of good site installations. Good Good data is a result of good site installations. Good count/speed/vehicle classification and weight data count/speed/vehicle classification and weight data is essential to the following customers:is essential to the following customers:

Some Internal Uses:Some Internal Uses:• Roadway Design uses our data to determine if Roadway Design uses our data to determine if

facility enhancements/lane additions are needed;facility enhancements/lane additions are needed;• Pavement Design uses our data to determine Pavement Design uses our data to determine

pavement type & thickness requirements;pavement type & thickness requirements;• Traffic Operations/Maint. Use it to determine lane Traffic Operations/Maint. Use it to determine lane

closure restrictions. And there are many others.closure restrictions. And there are many others.


COLLECTINGCOLLECTINGData uses (cont.)Data uses (cont.)

Some External Uses:Some External Uses:• The FHWA compiles data for use in national The FHWA compiles data for use in national

trend reports, national Truck Weight Study trend reports, national Truck Weight Study and other studies and for apportioning funds and other studies and for apportioning funds back to us;back to us;

• Advertisers and developers that need to know Advertisers and developers that need to know how many motorists are passing a given how many motorists are passing a given location in order to set sign and rates or location in order to set sign and rates or determine potential demand for retail outlets, determine potential demand for retail outlets, etc. (among many others).etc. (among many others).


COLLECTINGCOLLECTING• Two categories of traffic

monitoring sites have permanent equipment physically located in the roadway. These are TTMS and PTMS. They are the backbone of the traffic count program administered by the FDOT Central and District Offices.


COLLECTINGCOLLECTING• The data collected at these

sites may include: volume, speed, vehicle class and weight. The type of equipment installed and the programs set-up in the equipment determine how the site functions.

TELEMETERED TRAFFIC MONITORING SITETELEMETERED TRAFFIC MONITORING SITE• TTMS sites are the locations that are polled TTMS sites are the locations that are polled

via modem daily by the TRANSTAT Central via modem daily by the TRANSTAT Central Office computers. They record and transmit Office computers. They record and transmit every day of the year and provide the data every day of the year and provide the data used for adjusting short-term traffic counts used for adjusting short-term traffic counts to Annual Average Daily Traffic (AADT).to Annual Average Daily Traffic (AADT).

• TTMS sites are installed and maintained out TTMS sites are installed and maintained out of Central Office in Tallahassee.of Central Office in Tallahassee.

• Many have solar panelsMany have solar panels

TTMSTTMS

PTMS

TYPE II BASE MOUNTED

TYPE III PEDESTAL MOUNTED

PORTABLE TRAFFIC PORTABLE TRAFFIC MONITORING SITEMONITORING SITE

• PTMS locations are usually PTMS locations are usually installed on high volume urban installed on high volume urban arterials where rubber hose arterials where rubber hose counts or other equipment is counts or other equipment is difficult to install and maintain. difficult to install and maintain.

PTMSPTMS

PTMS

• The permanent part of the The permanent part of the installation is the cabinet and installation is the cabinet and loop/piezo wires installed in the loop/piezo wires installed in the pavement. Greater reliability, pavement. Greater reliability, personnel safety, and accuracy are personnel safety, and accuracy are the reason loops and piezos are the reason loops and piezos are preferred to hose counts.preferred to hose counts.

Loop

Piezo

PTMS

• Loops provide a volume count of Loops provide a volume count of vehicles crossing the loop vehicles crossing the loop sensors. The piezos provide sensors. The piezos provide classification count which classification count which measures the axles as the vehicle measures the axles as the vehicle crosses the piezo.crosses the piezo.

LOOP

PIEZO

PTMS

• To gather data, a traffic counter is To gather data, a traffic counter is normally placed in the cabinet and normally placed in the cabinet and attached to the wire harness for a attached to the wire harness for a short period (2 – 7 days) either short period (2 – 7 days) either annually or quarterly, then moved annually or quarterly, then moved from one site to another, hence the from one site to another, hence the term term portableportable traffic monitoring site. traffic monitoring site.

PTMS

ADR-1000 COUNTER IN CABINET

HISTORY HISTORY OF ISSUESOF ISSUES

Issue – PTMS Inspections Not Issue – PTMS Inspections Not PassingPassing• Resolution – Train DOT, Construction, Resolution – Train DOT, Construction,

Contract and Sub-contract employees Contract and Sub-contract employees on how to install a PTMS site.on how to install a PTMS site.

OBJECTIVE FOR OBJECTIVE FOR THIS CLASSTHIS CLASS

Above all, the need to follow Design Above all, the need to follow Design Standards and Plan Specifications.Standards and Plan Specifications.

• Design standards are reviewed every Design standards are reviewed every year and changes made as needed. year and changes made as needed. You need to keep a copy of the latest You need to keep a copy of the latest standards with you at all times.standards with you at all times.

• The following slide reflects a major The following slide reflects a major change to loops.change to loops.


Square Corners

OBJECTIVE OBJECTIVE FOR THIS FOR THIS

CLASSCLASSAbove all, the need to follow Above all, the need to follow Design Standards and Plan Design Standards and Plan Specifications.Specifications.

• Review the plans and follow the Review the plans and follow the placement, materials to be used placement, materials to be used and location precisely.and location precisely.• For Example: Loops are no longer to For Example: Loops are no longer to

be cut at a 45be cut at a 45° angle. Since the year ° angle. Since the year 2001 the standard is to drill corners 2001 the standard is to drill corners with a 1.5” bit by 2” minimum depth.with a 1.5” bit by 2” minimum depth.


CLASSCLASSAbove all, the need to follow Design Above all, the need to follow Design Standards and Plan Specifications.Standards and Plan Specifications.

• Loops Loops SHOULD NOT SHOULD NOT be cut across be cut across the concrete joint in the roadway. the concrete joint in the roadway. As the vehicles travel across the As the vehicles travel across the pavement, the pavement jars and pavement, the pavement jars and could loosen the loop wires and could loosen the loop wires and render them useless.render them useless.


CLASSCLASSAbove all, the need to follow Above all, the need to follow Design Standards and Plan Design Standards and Plan Specifications.Specifications.

• Piezos come with a warranty card. Piezos come with a warranty card. The warranty card must be filled The warranty card must be filled out and a copy of it placed in the out and a copy of it placed in the cabinet along with a copy of the cabinet along with a copy of the cabinet schematics.cabinet schematics.


Above all, the need to follow Above all, the need to follow Design Standards and Plan Design Standards and Plan Specifications.Specifications.The difference between a good The difference between a good and bad site!and bad site!

GoodGood Bad Bad


Above all, the need to follow Design Above all, the need to follow Design Standards and Plan Specifications.Standards and Plan Specifications.

• Every time a site does not Every time a site does not pass on the first inspection pass on the first inspection is wasted tax payer’s is wasted tax payer’s money. This affects all of us money. This affects all of us including you.including you.

GOING GOING FORWARDFORWARD

• The plans are delivered to the The plans are delivered to the Data Collection Manager, and Data Collection Manager, and they review them for proper they review them for proper location, design and placement.location, design and placement.


• The Data Collection Manager shall The Data Collection Manager shall be contacted by the contractor be contacted by the contractor and/or sub-contractor prior to any and/or sub-contractor prior to any installation. This includes the installation. This includes the cabinet, loops and piezos.cabinet, loops and piezos.


• The Data Collection Manager shall The Data Collection Manager shall be contacted when the site has been be contacted when the site has been installed and ready for inspection.installed and ready for inspection.

• In most cases, there is a bonus tied In most cases, there is a bonus tied to the project. If the site does not to the project. If the site does not pass….your company may lose or be pass….your company may lose or be the cause of any bonus not being the cause of any bonus not being paid.paid.


• In your travels throughout the district, if In your travels throughout the district, if you find a damaged site, please do the you find a damaged site, please do the following:following:• Take a picture of the damage.Take a picture of the damage.• Call Road Rangers or local police if the site was Call Road Rangers or local police if the site was

involved in an accident.involved in an accident.• Contact the Data Collection Manager Contact the Data Collection Manager

immediately.immediately.• In most cases, if the damage was caused by an In most cases, if the damage was caused by an

accident, we can recoup the cost of repair from accident, we can recoup the cost of repair from the at-fault insurance company.the at-fault insurance company.

CONTACT CONTACT INFORMATIOINFORMATIO

NNRUBIE FRASE – I am the RUBIE FRASE – I am the

main contact person for main contact person for District 5District 5

• 386-943-5380 – Office386-943-5380 – Office• 386-847-4289 - Cell386-847-4289 - Cell

• [email protected]

TECHNICAL TECHNICAL PRESENTATIONPRESENTATION

Presented byPresented by

Terry Robinson – Terry Robinson – Southern Traffic Southern Traffic

ServicesServices

PRE-ENGINEERINGPRE-ENGINEERING

PlanningPlanning

MaterialsMaterials

ActionAction


PLANNINGPLANNING• Sites are selected by the Data Sites are selected by the Data

Collection and Planning Office in most Collection and Planning Office in most scenarios.scenarios.

• Sites are approved by the District Sites are approved by the District Engineers.Engineers.

• Plans are developed by the Office of Plans are developed by the Office of Design and reviewed by the Data Design and reviewed by the Data Collection Office.Collection Office.


• PTMS sites are independent of one PTMS sites are independent of one another, and sites are built to fit the another, and sites are built to fit the location.location.

• Numerous departments are involved Numerous departments are involved with the building of a PTMS site. with the building of a PTMS site. Statistics office, Planning office, Statistics office, Planning office, Data office, Design office, Data office, Design office, Engineering office, Construction Engineering office, Construction division, etc.division, etc.


• Utility locates are completedUtility locates are completed• Pavement is cured and ready for Pavement is cured and ready for

sensorssensors• All equipment is on hand and All equipment is on hand and

meets Approved Product List meets Approved Product List (APL) and Qualified Product List (APL) and Qualified Product List (QPL)(QPL)


• Engineers have approved ALL Engineers have approved ALL Plans and changesPlans and changes

• Schedules have been approved Schedules have been approved by: Project Manager, Project by: Project Manager, Project Engineer, Traffic Operations Engineer, Traffic Operations Engineer, ConsultantEngineer, Consultant

• Maintenance of Traffic Plan Maintenance of Traffic Plan submitted and Approved.submitted and Approved.

WHAT ARE THE WHAT ARE THE COMPONENTS OF A PTMS COMPONENTS OF A PTMS

SITE?SITE?

MATERIALSMATERIALS• Cabinet – Type III, IV, and VCabinet – Type III, IV, and V• Piezoelectric sensorsPiezoelectric sensors• Inductive Loop sensorsInductive Loop sensors• Pull boxesPull boxes• Grounding electrodesGrounding electrodes• Surge ProtectionSurge Protection• ConduitConduit

MATERIALSMATERIALS

• Is cabinet in place?Is cabinet in place?• Does cabinet face the right direction?Does cabinet face the right direction?• Does cabinet meet plans and Does cabinet meet plans and

specifications?specifications?• Pull boxes in place and installed to Pull boxes in place and installed to

specifications?specifications?• All conduits in place?All conduits in place?• Have piezo sensors been tested prior to Have piezo sensors been tested prior to

installationinstallation

MATERIALSMATERIALS

• Do loop wires and cables Do loop wires and cables meet QPL?meet QPL?

• Are epoxies and sealants Are epoxies and sealants approved?approved?

• Are dates on piezos, sealants Are dates on piezos, sealants and epoxies recorded?and epoxies recorded?

ACTIONACTION

Areas of ConcernAreas of Concern• Maintenance of Traffic (MOT)Maintenance of Traffic (MOT)• Review of MOT PlanReview of MOT Plan• Placement of Temporary Traffic Placement of Temporary Traffic

Control DevicesControl Devices• Any ADDITIONAL SIGNS REQUIRED?Any ADDITIONAL SIGNS REQUIRED?• District or Area Public Information District or Area Public Information

Office Contacted?Office Contacted?

ACTIONACTION

• Verify all Public Safety and Local Verify all Public Safety and Local Governments are aware of Lane Governments are aware of Lane ClosuresClosures

• Update Traffic Operations if Update Traffic Operations if changes are made to MOT Planchanges are made to MOT Plan

• Notify ALL parties that all lanes Notify ALL parties that all lanes are open upon completionare open upon completion

BREAK TIMEBREAK TIME

INDUCTIVE LOOP INDUCTIVE LOOP ASSEMBLIESASSEMBLIES

• Inductive loops are simply a coil of Inductive loops are simply a coil of wire embedded in the road’s surface.wire embedded in the road’s surface.

• The loops that are installed in the The loops that are installed in the State of Florida and used by the FDOT State of Florida and used by the FDOT are usually 6’ X 6’ loops using 12 are usually 6’ X 6’ loops using 12 gauge wire consisting of 4 turns.gauge wire consisting of 4 turns.

• 2 loops are installed in each lane that 2 loops are installed in each lane that work in conjunction with the work in conjunction with the Piezoelectric Sensors.Piezoelectric Sensors.

INDUCTIVE LOOP INDUCTIVE LOOP ASSEMBLIESASSEMBLIES

• What is an inductor?What is an inductor?• An inductor is simply a coil of wire or an An inductor is simply a coil of wire or an

electromagnet.electromagnet.• The inductor or wire has a very low The inductor or wire has a very low

resistance. When a vehicle passes over resistance. When a vehicle passes over the loop, the inductance is elevated. the loop, the inductance is elevated. This unit of increase is measured in This unit of increase is measured in “Henry’s”, or microhenries. The vehicle “Henry’s”, or microhenries. The vehicle becomes the “inductor” or the coil.becomes the “inductor” or the coil.

LAYOUT OF SENSORSLAYOUT OF SENSORS

• Verify the space of the sensorsVerify the space of the sensors• Standard spacing is 16 feet from Standard spacing is 16 feet from

leading edge of leading loop to leading edge of leading loop to leading edge of trailing loopleading edge of trailing loop

• Loops MUST be in CENTER of lane Loops MUST be in CENTER of lane and MUST NOT cross expansion and MUST NOT cross expansion joints unless approved by joints unless approved by Engineer prior to installationsEngineer prior to installations


• Standard loops are 6 foot by 6 foot, 4 Standard loops are 6 foot by 6 foot, 4 turns on each loopturns on each loop

• Loops cut in asphalt SHALL be cut to a Loops cut in asphalt SHALL be cut to a depth of 3 inches or deeperdepth of 3 inches or deeper

• Loops cut in concrete SHALL be cut 2.5 Loops cut in concrete SHALL be cut 2.5 inches or deeperinches or deeper

• Piezo Sensors shall be placed on one Piezo Sensors shall be placed on one side of the lane and NOT placed in the side of the lane and NOT placed in the middle of the lanemiddle of the lane


LOOP

PIEZO

LOOPS & LOOP LOOPS & LOOP INSTALLATIONSINSTALLATIONS

• Loops shall be installed as per FDOT Loops shall be installed as per FDOT Standards and SpecificationsStandards and Specifications

• FDOT District 5 Standards REQUIRE FDOT District 5 Standards REQUIRE that LOOPS ARE NOT TO BE SPLICEDthat LOOPS ARE NOT TO BE SPLICED

• Loop wires are to be checked prior Loop wires are to be checked prior to installationto installation

• Loops are to be placed in the Loops are to be placed in the BOTTOM of the slotsBOTTOM of the slots


• Insure there are not any scars, rips, Insure there are not any scars, rips, insulation abrasions, or kinks in the insulation abrasions, or kinks in the wire assemblywire assembly

• All loops will be DRILLED in the corner All loops will be DRILLED in the corner using a 1.5 inch diameter bitusing a 1.5 inch diameter bit

• Make sure slots are clear of debris, Make sure slots are clear of debris, rocks, and asphalt depositsrocks, and asphalt deposits

• Verify depths are uniform throughout Verify depths are uniform throughout the entire cutthe entire cut


• No loops shall be installed in WET No loops shall be installed in WET asphalt or concreteasphalt or concrete

• Do not apply sealants if roadway has Do not apply sealants if roadway has residue or moisture in slots or on residue or moisture in slots or on surface around cutssurface around cuts

• A minimum of 2 inches of clearance A minimum of 2 inches of clearance from the top of the loop wire in the slot from the top of the loop wire in the slot to the surface of the roadway is to the surface of the roadway is requiredrequired


• Loops shall be twisted a minimum Loops shall be twisted a minimum of 6 to 12 turns per foot of 6 to 12 turns per foot throughout the entire homerun throughout the entire homerun lengthlength

• Loops shall be marked in pull box Loops shall be marked in pull box and inside the cabinetand inside the cabinet

• Homeruns shall be placed in the Homeruns shall be placed in the bottom of each cutbottom of each cut


• The homerun cut will start at 3 The homerun cut will start at 3 inches deep and for each inches deep and for each additional homerun added to the additional homerun added to the slot and additional ½ inch will be slot and additional ½ inch will be cut to the depthcut to the depth

• This process will allow for fewer This process will allow for fewer homerun cuts to the roadwayhomerun cuts to the roadway

PULL BOX

LOOPPIEZO

HOMERUN

CONDUIT


• We test all loops upon final We test all loops upon final inspectioninspection

• We are checking the insulation, We are checking the insulation, signal strength and circuit of the signal strength and circuit of the loopsloops

• We WILL NOT pass any loop that We WILL NOT pass any loop that does no meet Entire Minimum does no meet Entire Minimum SpecificationsSpecifications

PIEZO INSTALLATIONSPIEZO INSTALLATIONS

• Piezoelectric sensors most Piezoelectric sensors most commonly used by FDOT are commonly used by FDOT are Measurement Specialties Measurement Specialties Incorporated (MSI) – BL RoadtraxIncorporated (MSI) – BL Roadtrax

• Sensors – BL is short for Brass Sensors – BL is short for Brass LinguiniLinguini


• Piezoelectric systems use Piezoelectric systems use piezoelectric sensors. The sensors piezoelectric sensors. The sensors are embedded in a conducting are embedded in a conducting material. When weight is applied the material. When weight is applied the pressure changes the voltage of the pressure changes the voltage of the electric charge flowing through the electric charge flowing through the conductor. The sensors measure the conductor. The sensors measure the change in voltage and calculate the change in voltage and calculate the load.load.

PIEZO SENSORSPIEZO SENSORS

• The base technology is piezoelectric The base technology is piezoelectric polymer. The Brass Linguini is a highly polymer. The Brass Linguini is a highly compressed piezoelectric polymer in a compressed piezoelectric polymer in a coaxial configuration, with brass outer coaxial configuration, with brass outer casing.casing.

• The BL is flat, about 1/16” (1.5mm) thick The BL is flat, about 1/16” (1.5mm) thick and ¼ “ (7mm) wide. The sensors are and ¼ “ (7mm) wide. The sensors are put into the road in a ¾” (19mm) wide put into the road in a ¾” (19mm) wide and 1.5” (25mm) deep slot cut in the and 1.5” (25mm) deep slot cut in the road.road.


InstallationsInstallations• Piezo sensors are to be installed to Piezo sensors are to be installed to

Manufacture SpecificationsManufacture Specifications• All warranty cards and manufacture All warranty cards and manufacture

paperwork shall be left in the cabinet paperwork shall be left in the cabinet upon installationupon installation

• All testing of sensors are to be All testing of sensors are to be performed in front of a Representative performed in front of a Representative of the FDOTof the FDOT


InstallationsInstallations• Epoxies to be used are as follows:Epoxies to be used are as follows:• AS475: asphalt, modified mixes, AS475: asphalt, modified mixes,

superpave roadwayssuperpave roadways• G100-EBOND: concreteG100-EBOND: concrete

• NO SPLICING OF PIEZO SENSORSNO SPLICING OF PIEZO SENSORS• All piezo sensors MUST be marked in All piezo sensors MUST be marked in

each pull box and inside of cabineteach pull box and inside of cabinet


InstallationsInstallations• Re-test all piezo sensors in Re-test all piezo sensors in

cabinetcabinet• ***Piezo sensors shall be pushed ***Piezo sensors shall be pushed

down to .250 inches below down to .250 inches below surface of roadway*** This is a surface of roadway*** This is a NEW application in FDOT NEW application in FDOT Standards!!!Standards!!!

PULL BOX AND PULL BOX AND CONCRETE APRONSCONCRETE APRONS

• Pull boxes may be made of Quazite Pull boxes may be made of Quazite material or concrete with a steel lidmaterial or concrete with a steel lid

• All pull boxes must have locking bolts All pull boxes must have locking bolts and screwsand screws

• Each pull box is required to have a Each pull box is required to have a concrete apron that is 12 inches off concrete apron that is 12 inches off each edge, 4 inches deep and slopes each edge, 4 inches deep and slopes away to the surface around the pull away to the surface around the pull boxbox

PULL BOX AND PULL BOX AND CONCRETE APRONSCONCRETE APRONS

• Pull boxes shall have a minimum Pull boxes shall have a minimum of 8 inches of washed gravel of 8 inches of washed gravel inside of the baseinside of the base

• All pull boxes shall have clearly All pull boxes shall have clearly marked cables and conduitsmarked cables and conduits

CABINETSCABINETS

• All cabinets should meet the All cabinets should meet the Specifications on the plansSpecifications on the plans

• All cabinets shall be mounted 48 All cabinets shall be mounted 48 inches off the ground measured to inches off the ground measured to the handle of the cabinet to groundthe handle of the cabinet to ground

• The cabinet shall have proper The cabinet shall have proper grounding and grounding grounding and grounding electrodes in placeelectrodes in place

IN-ROAD SENSOR IN-ROAD SENSOR TEMPLATESTEMPLATES

• The most common configuration The most common configuration used is the Loop-Piezo-Loop.used is the Loop-Piezo-Loop.

• Piezo-Loop-Piezo configurations Piezo-Loop-Piezo configurations are also used in some scenarios.are also used in some scenarios.

• WIM or Weigh in Motion sites WIM or Weigh in Motion sites most commonly use Piezo-Loop-most commonly use Piezo-Loop-Piezo configurations.Piezo configurations.

IN-ROAD SENSOR IN-ROAD SENSOR TEMPLATESTEMPLATES

• PTMS sites that collect volume PTMS sites that collect volume and speed only by lane are made and speed only by lane are made up of loop-loop configurations.up of loop-loop configurations.

• The type of sensors to be The type of sensors to be installed will be determined by installed will be determined by the appropriate parties and the appropriate parties and placed in the design plans.placed in the design plans.

SITE LAYOUT AND SITE LAYOUT AND MEASUREMENTSMEASUREMENTS

• Determine where the Piezo sensor Determine where the Piezo sensor will be placed in the lane.will be placed in the lane.

• Piezos are always laid Piezos are always laid perpendicular to the lane.perpendicular to the lane.

• Mark the line with crayon or paint Mark the line with crayon or paint using a straight edge.using a straight edge.

• Add 6 inches to the length of the Add 6 inches to the length of the piezo to insure the length is correct.piezo to insure the length is correct.


• The piezo The piezo MUST BEMUST BE located between the located between the loops in the travel lane.loops in the travel lane.

• Measure upstream from the piezo 5 feet Measure upstream from the piezo 5 feet and mark this spot with crayon or paint.and mark this spot with crayon or paint.

• Measure from the piezo 11 feet and mark Measure from the piezo 11 feet and mark with crayon or paint.with crayon or paint.

• Using the center point we have already Using the center point we have already determined, we will now layout the loop.determined, we will now layout the loop.


• The loop is marked and painted.The loop is marked and painted.• Using a steel tape we will now Using a steel tape we will now

measure 16 feet downstream and measure 16 feet downstream and make a mark, this is the leading edge make a mark, this is the leading edge for the trailing loop. We will now for the trailing loop. We will now measure 22 feet from the leading loop measure 22 feet from the leading loop (this is 6 feet behind the mark we just (this is 6 feet behind the mark we just made). We now have the second loop made). We now have the second loop ready to mark and paint.ready to mark and paint.


• We will use a straight edge that is at We will use a straight edge that is at least 6 feet long to mark each leg of least 6 feet long to mark each leg of the loops.the loops.

• A Laser may also be used to insure the A Laser may also be used to insure the loops are parallel in the lane.loops are parallel in the lane.

• We now have a loop-piezo-loop We now have a loop-piezo-loop configuration.configuration.


• Check the loops from the stripe using a Check the loops from the stripe using a steel tape, each loop should be the steel tape, each loop should be the same distance from the edge line or same distance from the edge line or skip line, if not check the skip line, if not check the measurements and adjust until the measurements and adjust until the distances are the same.distances are the same.

• See diagrams for reference.See diagrams for reference.

CONSTRUCTION CONSTRUCTION CHECKLIST - PIEZOSCHECKLIST - PIEZOS

1.1. Type I or IIType I or II

2.2. Cable length of piezo sensorsCable length of piezo sensors

3.3. Approved Epoxy on Approved Approved Epoxy on Approved Products ListProducts List

4.4. Depth of saw cut – 7/8” – 1.25” Depth of saw cut – 7/8” – 1.25” to 1.5”to 1.5”

5.5. Width of saw cut – ¾” – 7/8”Width of saw cut – ¾” – 7/8”


6.6. Piezo tested prior to installationsPiezo tested prior to installations

7.7. Warranty cards filled out Warranty cards filled out completelycompletely

8.8. Slots clean of debris and waterSlots clean of debris and water

9.9. Epoxy mixed to manufacturer’s Epoxy mixed to manufacturer’s standardstandard

10.10. Duct tape applied to each side of Duct tape applied to each side of piezo cutpiezo cut


11.11. Epoxy poured in several lifts or Epoxy poured in several lifts or layerslayers

12.12. Sensor cables at correct depthSensor cables at correct depth

13.13. Sensors retested after epoxy is Sensors retested after epoxy is appliedapplied

14.14. Manufacturer install sheets Manufacturer install sheets completedcompleted

15.15. Cables marked with lane of piezoCables marked with lane of piezo

CONSTRUCTION CONSTRUCTION CHECKLIST - LOOPSCHECKLIST - LOOPS

1.1. Loops are corrected cut and Loops are corrected cut and corners drilled.corners drilled.

2.2. Loops are cut at correct depthLoops are cut at correct depth

3.3. Loop wire is 12 gauge wire that is Loop wire is 12 gauge wire that is gasoline and oil resistantgasoline and oil resistant

4.4. Loop wire is placed into bottom of Loop wire is placed into bottom of slot, no visible kinks or knots in slot, no visible kinks or knots in wirewire


5.5. Wire is applied with a blunt object Wire is applied with a blunt object (not a screwdriver, knife, etc.)(not a screwdriver, knife, etc.)

6.6. Loop wire is turned 4 times in gridLoop wire is turned 4 times in grid

7.7. Loop wire is continuous with no Loop wire is continuous with no splices in roadwaysplices in roadway

8.8. Loop slots are clean and compressed Loop slots are clean and compressed air used to blow out slotsair used to blow out slots

9.9. Loop slots are dryLoop slots are dry


10.10. Loop wire is placed in slot only Loop wire is placed in slot only when all saws and blowers are when all saws and blowers are no longer in useno longer in use

11.11. Loop wires are twisted at Loop wires are twisted at homerun junction – 6-12 twists homerun junction – 6-12 twists per footper foot

12.12. Wire is re-inspected for cuts, Wire is re-inspected for cuts, nick, knots.nick, knots.


13.13. Wire is placed into conduit and Wire is placed into conduit and gently pulled to pull boxes.gently pulled to pull boxes.

14.14. Loop wires are marked in pull Loop wires are marked in pull box and coiled with 12-18 inches box and coiled with 12-18 inches of excess wireof excess wire

15.15. Wire is tested for inductance and Wire is tested for inductance and continuitycontinuity

CONSTRUCTION CONSTRUCTION CHECKLIST – PULL CHECKLIST – PULL

BOXESBOXES1.1. Pull box meets specificationPull box meets specification

2.2. Pull box is placed in solid groundPull box is placed in solid ground

3.3. Pull box has correct depth of washed Pull box has correct depth of washed gravelgravel

4.4. Pull box has a 5’ concrete pad surrounding Pull box has a 5’ concrete pad surrounding itit

5.5. Pull box is level and allows water to run off Pull box is level and allows water to run off and not collect in or on pull boxand not collect in or on pull box

6.6. Grass and aggregates are placed around Grass and aggregates are placed around pull box to prevent erosionpull box to prevent erosion

CONSTRUCTION CONSTRUCTION CHECKLIST - CABINETSCHECKLIST - CABINETS

1.1. Cabinet should meet SpecificationsCabinet should meet Specifications

2.2. Cabinet should be securely anchoredCabinet should be securely anchored

3.3. Cabinet should be properly groundedCabinet should be properly grounded

4.4. Cabinet should be mounted with the Cabinet should be mounted with the center of the cabinet at 48” from the center of the cabinet at 48” from the groundground

5.5. Cabinet should be facing away from Cabinet should be facing away from the roadwaythe roadway

PTMS CHECKLISTPTMS CHECKLIST

• Are piezo lengths correct? ______Are piezo lengths correct? ______• Are piezo cables long enough to reach Are piezo cables long enough to reach

the cabinet? ______the cabinet? ______• Is the epoxy being used approved and Is the epoxy being used approved and

mixed properly? ______mixed properly? ______• Is loop wire 12 gauge and gasoline and Is loop wire 12 gauge and gasoline and

oil resistant? ______oil resistant? ______• Are loops located in the center of the Are loops located in the center of the

lane? ______lane? ______


• Have piezos been checked prior to Have piezos been checked prior to placement in road? ______placement in road? ______

• Has warranty card and paperwork been Has warranty card and paperwork been completed? ______completed? ______

• Is roadway clean and all equipment Is roadway clean and all equipment turned off before sensors installed? turned off before sensors installed? ____________

• Are saw cuts clean and is depth the same Are saw cuts clean and is depth the same throughout entire loop/piezo? ______throughout entire loop/piezo? ______

• Are corners of loops drilled with a 1 1/2” Are corners of loops drilled with a 1 1/2” bit? ______bit? ______


• Do loop wires lay in bottom of slots Do loop wires lay in bottom of slots without rise and falls? ______without rise and falls? ______

• Is loop wire twisted at homerun Is loop wire twisted at homerun intersection? ______intersection? ______

• Do loop wires have any kinks or cuts? Do loop wires have any kinks or cuts? ________

• Is loop sealant applied evenly and Is loop sealant applied evenly and covers all the slots? ______covers all the slots? ______

• Is the excess loop sealant removed Is the excess loop sealant removed from the roadway? ______from the roadway? ______


• Is epoxy mixed correctly? ______Is epoxy mixed correctly? ______• Is epoxy on the APL list? ______Is epoxy on the APL list? ______• Was the piezo epoxy applied in layers? Was the piezo epoxy applied in layers?

___ ___• Is epoxy cured and dry? ______Is epoxy cured and dry? ______• Is loop wire labeled? ______Is loop wire labeled? ______• Are pull boxes approved? ______Are pull boxes approved? ______• Are pull boxes correctly installed? Are pull boxes correctly installed?

____________• Washed gravel in pull boxes? ______Washed gravel in pull boxes? ______


• Did the contractor assign lane Did the contractor assign lane numbers inside the cabinet to numbers inside the cabinet to piezos/loops? ______piezos/loops? ______

• Is cabinet level? ______Is cabinet level? ______• Is cabinet accessible? ______Is cabinet accessible? ______• Is the dirt and grass replaced? ______Is the dirt and grass replaced? ______• Is dirt compacted to avoid erosion Is dirt compacted to avoid erosion

issues? ______issues? ______• Are all dust, residue and compounds Are all dust, residue and compounds

out of the roadway? ______out of the roadway? ______


• Is cabinet and grounding according to Is cabinet and grounding according to specifications? ______specifications? ______

• Is conduit being used approved? Is conduit being used approved? ____________

• Are all schematic, paperwork, and Are all schematic, paperwork, and warranty cards placed in cabinet? warranty cards placed in cabinet? ____________

• Does cabinet lock and secure Does cabinet lock and secure properly? ___properly? ___

QUESTIONS?QUESTIONS?

PORTABLE TRAFFIC MONITORING SITE INSTALLATION AND INSPECTION TRAINING

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Transcript of PORTABLE TRAFFIC MONITORING SITE INSTALLATION AND INSPECTION TRAINING