Post on 18-Jan-2016
TDOT’s Evolving Highway Safety
Bruce Aquila, Intergraph Corporation
Wednesday October 28th, 2015
Background• TDOT and Intergraph are
Valued Partners– Solutions
• TRIMS (1996)• HSIP (2006)• E-TRIMS (2008)• Image Viewer (2014)• SLD (2015)
– LRS/Geospatial Platform• MGE (1993)• GeoMedia (1999)
The Problem/Drivers - Things Change
• SAFETEA-LU – Changed way States look at
improving Roadway Safety– States develop a Strategic
Highway Safety Plan (SHSP)• Based on accurate/timely safety
data
– Established Highway Safety Improvement Program (HSIP)
– Identify High Risk Rural Roads Program (HRRRP)
FHWA Emphasis Areas
• Local & Rural Road Safety
• Pedestrian & Bicycle Safety
• Roadway Departure Safety
• Fatal/Incapacitating Injury Crashes
Drove modification to existing tools at TDOT
Ground Work
• TDOT produced a list of potential Safety Improvement Projects
• Software determined Sections, Spots and Intersection Locations
• Separate Highway types - Rural and Urban
• Compared Locations to Statewide Averages and Critical Rates
• Results contained many Locations on Prior Lists
Data - The Key
• Crashes collected by Public Safety
• TDOT determines location on network
• Crashes imported into TRIMS• TRIMS contains
Roadway/Traffic Data • System uses TRIMS data to
create Roadway Safety Analysis Locations
Getting Ahead of the Curve
• Flexible to Evolve as Priorities Change
• Use all Available Crash Attributes
• Include Project List Management in Tool
• Show prior Locations Studied/Improved
• Easy to Use/Available to more Users
Process starts by Creating a Study
• What Roads to Include?• What Date Ranges to
Study?• Criteria for Determining
Sections?• Define Required Confidence
Level Needed?
What if you want to use more than one study criteria?
Create Multiple Studies
• 3 years Crash History used for HSIP
• 6 years Crash History for HRRR
• For Corridor Analysis combine:– All Multi-lane Roadways or – Separate Divided and
Undivided
• Create Section Breaks for City Limits or Ignore
• Create Multiple Studies as Needed
Building a Study
• Flexible Analyzing Data
Steps in Creating a Study• Create Segments
– Breaks Roadways into Homogeneous Sections
• Calculate Intersection Entering Volume– Adds Traffic Volumes from all Legs of Intersection
• Create Locations– Creates Sections, Spots and Intersection Locations
• Calculate Rates– Statewide & Critical Crash Locations
Create a Study for Every Need
Build Project List
• Query the Study to meet Goals
• Query Roads to Include• Query Areas to Study• Create Criteria to include
Locations in Potential Projects List
• Include Multiple Criteria in List
• Evaluate potential projects from Final List
Which Roads to Include?
Narrow the Geographic Area
Build Criteria
Advanced Query Capability
Compare two column values
Advanced Query Capability
Compare a column to a value
Advanced Query Capability
Compare the sum of multiple columns to a value
Criteria Building - Column to Column• CRASH RATE• CRITICAL RATE• FATAL CRASH RATE• FATAL LANE DEPARTURES• FATAL PEDAL CYCLE CRASHES• FATAL PEDESTRIAN CRASHES• INCAP INJURY RATE• INCAP LANE DEPARTURES• INCAP PEDAL CYCLE
CRASHES• INCAP PEDESTRIAN CRASHES• LANE DEPARTURE CRASH
RATE• PEDAL CYCLISTS INCAP INJ• PEDAL CYCLIST KILLED• PEDESTRIANS INCAP INJURED
• PERSONS INCAP IN LANE DEPART.
• PERSONS KILLED IN LN DEPART
• SEVERE CRASH RATE• TOTAL CRASHES• TOTAL FATAL CRASHES• TOTAL INCAP INJURY
CRASHES• TOTAL LANE DEPARTURES• TOTAL PEDAL CYCLE
CRASHES• TOTAL PEDESTRIAN CRASHES• TOTAL PERSONS KILLED• TOTAL PERSONS INCAP
INJURED• OTHERS
Criteria Building
Criteria BuildingUse Sum Query to Add Two Column Values
Query for locations having total Fatal Lane Departure crashes + Incap Lane Departure crashes > 3
Query Results
Excluded locations are highlighted
Tracking Exclusions
• Certain Locations showed up Annually– Even after being addressed
• Built an Exclusions Database: – Monitors sections with
determinations made in past
• Exclusion Reason noted and Edited as required
• Exclusions highlighted on Query Results and Final Lists
Exclusions
Comments box used to update status of project
Final List
• Completed queries added to final Location List
• Listed Projects:– Analyzed to refine
potential projects– Stored in database until
Validation and Safety audits performed
Select Locations for Final List
List Management
Click Criteria Description and see the query that included the location
Exclude From List
Exclude Entry
Exclusions Used to Track Projects
Corridor Query
• Works like other queries:– Combines Adjacent like
Sections
• Averages AADT and Sums Crash Totals
• Crash Rates Re-calculated
• Separate Study with own List
Multi-County Corridor Study
Corridor Query – Fatal Bike/Pedestrian
Corridor Locations Fatal Crashes
Lessons Learned
• Safety Emphasis Areas continue to Evolve
• Good Reporting Tools needed to support these changes
• Roadway/Crash data quality improving
• Improved Safety crucial to Highway Needs Assessment
Questions
Bruce Aquila
Transportation Consultant
Intergraph Corporation
Bruce.aquila@intergraph.com
Thank You !!!