County of Fairfax, Virginia
Reston Network AnalysisExisting Phasing Analysis & 2050 Tier 3
August 8 & 10, 2016Advisory Group & Stakeholders Meeting
Kristin CalkinsFairfax County Department of Transportation
County of Fairfax, Virginia
Purpose of Study• Conduct a detailed analysis of the grid of streets
to determine:– Number of lanes between and at intersections– How to best serve pedestrians, bikes and transit– Right-of-way needs
• Assign urban street types and modal emphasis based on Department of Rail and Public Transportation Multimodal System Design Guidelines
• Conduct a phasing analysis of when larger projects are needed
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Data Collection• Traffic
Counts in June 2015
• Travel Time Runs
Existing Conditions• Capacity
Analysis • Level of
Service
Test Grid of Streets (2030 & 2050)• Traffic
Forecasting Capacity Analysis
• Level of Service
Mitigation• Signal re-
timing• New links• Turn lanes• Additional
lanes
Roadway Classification• DRPT Design
Guidelines• Bike lanes• Sidewalks/
Pedestrian routes
• On-Street Parking
• Transit Routes
Finalize Grid of Streets (2030 & 2050) Based on:• Advisory
Group input• Stakeholder
input• Community
input
Phasing Analysis• Prioritizatio
n of larger projects
Network Analysis Project Process
Advisory Group input, Stakeholder input, Community input
County of Fairfax, Virginia
Phasing AnalysisExisting Conditions
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County of Fairfax, Virginia
Existing Conditions Phasing Analysis
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• This process will help the prioritize roadway improvements in the Reston TSAs
• Based on greatest improvement in congestion compared the network without the project
• When Tier 3 is finalized a 2050 phasing analysis will be completed to determine long term importance
County of Fairfax, Virginia
Existing Conditions Phasing Analysis
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Reston Phasing Analysis Projects
Grid of StreetsDTR Crossing at Soapstone Overpass – Sunrise Valley Dr to Sunset Hills RdDTR Town Center Parkway Underpass – Sunrise Valley Dr to Sunset Hills RdFox Mill Road Widening – Reston Parkway to Monroe StreetMonroe Street Widening – West Ox Road to Town of HerndonPinecrest Road Extension – South Lakes Dr to Sunrise Valley DrReston Parkway Widening – South Lakes Drive to DTRFairfax County Parkway - DTR to West Ox HOVFairfax County Parkway at Sunrise Valley Drive (Interchange)South Lakes Drive Overpass – Sunrise Valley Drive to Sunset Hills RdWest Ox Road Widening – Lawyers Road to Centreville RoadSunset Hills Road Widening – Fairfax County Parkway to Wiehle (6) and Wiehle to Hunter Mill Road (4)
County of Fairfax, Virginia
Existing Conditions Phasing Analysis
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County of Fairfax, Virginia
Phasing Analysis Process• The base year (2015) VISUM AM and
PM peak hour models were the starting point for the phasing analysis.
• Each planned improvement was added to the base year VISUM model.
• Vehicle hours travelled (VHT) were used to measure traffic congestion and benefit of each improvement.
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County of Fairfax, Virginia
Results – Existing Phasing Analysis
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Improvement Ranking Hours of Delay w/ Project vs. Existing Conditions
Grid of Street Grid of Streets 1 -1,216
Town Center Town Center Parkway Underpass 2 -374
Soapstone Soapstone Overpass 3 -300
FCP/HOV Fairfax County Parkway - 6 lanes with High Occupancy Vehicle (HOV) lane(s) 4 -299
Sunset Hills Widen Sunset Hills Road – 6 lanes from Wiehle Ave to Fairfax County Pkwy, and 4 lanes from Wiehle Ave to Hunter Mill Road 5 -257
South Lakes South Lakes Overpass 6 -240
FCP/SRV Fairfax County Parkway and Sunrise Valley Drive Interchange 7 -184
Reston Pkwy Widen Reston Parkway - 6 lanes from South Lakes Drive to the DAAR 8 -82
Monroe Widen Monroe Street - 4 lanes from West Ox Road to the Town of Herndon 9 -27
Pinecrest Extend Pinecrest Road from South Lakes Drive to Sunrise Valley Drive 10 -2
Fox Mill Widen Fox Mill Road - 4 lanes from Reston Parkway to Monroe Street 11 0
West Ox Widen West Ox Road - 4 lanes from Lawyers Road to Centreville Road 12 28
County of Fairfax, Virginia
Tier 3
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County of Fairfax, Virginia
Mitigation Options• Mitigation Measures - Tiered Approach
– Tier 1: No right of way (ROW) impact – Tier 2: Some right of way impact– Tier 3: Large scale mitigations if needed
– Consultation with Advisory Group and Stakeholders
• Each grid link is initially assumed to be one lane in each direction (with bike/ped facilities as specified in the Comprehensive Plan)
– No turn lanes were initially assumed at new intersections
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County of Fairfax, Virginia
2050 2nd Tier Problem Locations
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• Unmitigated had 22 Problem Locations• After Tier 1: 13 Problem Locations• After Tier 2: 9 Problem Locations
– 3 are in Innovation TSA which has already been finalized
– 6 are associated with identified follow-on tasks• Fairfax County Parkway & Spring Street• Fairfax County Parkway & Sunrise Valley Drive• Reston Parkway: From Lawyers Road to Baron Cameron
Ave.
County of Fairfax, Virginia
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2050 2nd Tier Problem Locations
County of Fairfax, Virginia
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Network Analysis Follow-On Tasks
Fairfax County Pkwy. & Spring St.
Reston Pkwy. Capacity Improvements
Fairfax County Pkwy. & Sunrise Valley Dr.
County of Fairfax, Virginia
Fairfax County Parkway & Spring Street
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FCP & Spring Street No Build
Lane Configuration & PM LOS
IntersectionNo-build LOS (PM)
Fairfax County Parkway & Spring Street Ramp B
Spring Street & Fairfax County Parkway Ramp F
Spring Street & Herndon Parkway C
Pros Cons• Improves conditions on Spring
Street and Herndon Parkway• Removes slip ramp to southbound
Fairfax County Parkway
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F
BFa
irbro
ok D
rive
Spring Street
FCP & Spring Street Option 1: Fairbrook Drive Ramp
Pros Cons• Maintains existing traffic patterns• Operating conditions are acceptable
• Geometry for ramp curvature will need to be investigated
Lane Configuration & PM LOS
IntersectionNo-build LOS (PM)
Option 1 LOS (PM)
Fairfax County Parkway & Spring Street Ramp B B
Spring Street & Fairfax County Parkway Ramp F D
Spring Street & Herndon Parkway C C
Fairbrook Dr & Fairfax County Parkway Ramp - B17
D
B
B
Fairb
rook
Driv
e
Spring Street
FCP & Spring Street Option 2: Bi-Directional Ramp
Pros Cons• Eliminates traffic
signal along Fairfax County Parkway for improved operating conditions over no-build scenario
• Installation of a traffic signal on Spring Street on the west side of Fairfax County Parkway
• Construction of loop ramp requires large property takings
• Operating conditions at the new signalized intersection are at capacity during the AM peak hour.
• Creating a direct connection from the toll road may be confusing for drivers.
Lane Configuration & PM LOS
IntersectionNo-build LOS (PM)
Option 2 LOS (PM)
Spring Street & Fairfax County Parkway Ramp F D
Spring Street & Herndon Parkway C C
Sunset Hills Road & Fairfax County Parkway NB exit ramp - D
D
DFairb
rook
Driv
e
Spring Street
FCP & Spring Street Option 3: Ramp to NB FCP
Pros Cons• Eliminates traffic signal along Fairfax
County Parkway for improved operating conditions over No-build
• Smaller area of impact over loop ramps• Individual intersections provide for less
delay with all intersections operating at LOS D or better during the peak hours.
• Installation of a traffic signal on Spring Street on the west side of Fairfax County Parkway
• A new weave is created along Fairfax County Parkway between the Toll Road and Spring Street.
Lane Configuration & PM LOS
IntersectionNo-build LOS (PM)
Option 3 LOS (PM)
Spring Street & Fairfax County Parkway Ramp F C
Spring Street & Herndon Parkway C C
Sunset Hills Road & Fairfax County Parkway NB exit ramp - C
C
CFairb
rook
Driv
e
Spring Street
County of Fairfax, Virginia
Fairfax County Parkway & Sunrise Valley Drive
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FCP & Sunrise Valley Drive No Build
Intersection No-build LOS (PM)
Fairfax County Parkway & Sunrise Valley Drive F
Pros Cons• Does not require construction or
new right-of-way• Travelers will experience delays in
excess of 100 seconds
No Build Assumes Fairfax County Parkway is Widened to 6 lanes
F
FCP & SRVD Option 1: Single Point Urban Interchange (SPUI)
Pros Cons• Provides improved operating
conditions over No-build • One signalized intersection• Queuing does not impact adjacent
intersections
• Large area of impact compared to a tight diamond for the approach ramps
• Larger crossing distances for pedestrians
Intersection No-build LOS (PM)
Option 1 LOS (PM)
Fairfax County Parkway & Sunrise Valley Drive F D
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D
Fairfax County Parkway Bridge over Sunrise Valley Drive
FCP & SRVD Option 2: Tight Diamond Interchange
Pros Cons• Provides improved operating
conditions over No-build• Potentially smaller area of impact
over SPUI
• Queues impact adjacent intersections• Requires an additional signalized
intersection• Signal coordination between
intersections can be a concern and lead to vehicles getting “trapped” between intersections and creating additional delay
Intersection No-build LOS (PM)
Option 2 LOS (PM)
Fairfax County Parkway & Sunrise Valley Drive F -
Fairfax County Parkway (NB) & Sunrise Valley Drive - D
Fairfax County Parkway (NB) & Sunrise Valley Drive - D23
DD
Fairfax County Parkway Bridge over Sunrise Valley Drive
Graphic is illustrative, intersections would be constructed closer together
County of Fairfax, Virginia
Reston Parkway
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County of Fairfax, Virginia
Reston Parkway
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• Option 1: Super Streets– Restricted left turns at:
• Spectrum Drive• Bowman Towne/Green Drive• New Dominion Parkway• Bluemont Way/Stratford Park Place• South Lakes Drive• Glade Drive• Fox Mill Road
– U-Turns at: • Between Bowman Towne Drive and Baron Cameron• Market Street/Stratford House Place• Sunrise Valley Drive• Between South Lakes Drive and Glade Drive• Between Glade Drive and Colts Neck Road• Colts Neck Road
• Option 2– Flyover from WB Sunset Hills Road to SB Reston Parkway– New Road connecting Lawyers Road to Fox Mill Road behind Park &
Ride
County of Fairfax, Virginia
Bowman Towne Drive
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Reston Parkway Alternatives
Stratford House PlaceMarket Street
Baron Cameron Avenue
No-Build Super Street
New Dominion Parkway
*Pedestrian Signal
Bluemont Way
Sunset Hills Road
WB DTR
EB DTR
Bowman Towne Drive
Stratford House Place
Market Street
Baron Cameron Avenue
Convert to Median U-Turns
Bluemont Way
Sunset Hills Road
WB DTR
EB DTR
Dual WB Left Turns
Median U-Turns
No Left Turns
New Dominion Parkway No Left Turns
No Left Turns
Bowman Towne Drive
Stratford House Place
Market Street
Baron Cameron Avenue
Sunset Fly Over & Lawyers Bypass
New Dominion Parkway
*Pedestrian Signal
Bluemont Way
Sunset Hills Road
WB DTR
EB DTR
Dual WB Left Turns
WB Left Flyover Ramp
County of Fairfax, Virginia
Colts Neck Road Colts Neck Road
Fox Mill RoadFox Mill Road
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Reston Parkway Alternatives (Cont.)No-Build
WB DTR
EB DTR
Sunrise Valley Drive
Right In/Right Out
South Lakes Drive
Glade Drive
Lawyers Road
WB DTR
EB DTR
Right In/Right Out
No Left Turns
Sunrise Valley Drive
South Lakes Drive
Glade Drive
Lawyers Road
NB U-Turn
No NB/SB Left Turns
Median U-Turns
Median U-Turns
U-Turns
No NB Lefts
Colts Neck Road
Fox Mill Road
WB DTR
EB DTR
Sunrise Valley Drive
Right In/Right Out
South Lakes Drive
Glade Drive
No NB Lefts
Super Street Sunset Fly Over & Lawyers Bypass
County of Fairfax, Virginia
Bowman Towne Drive
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Reston Parkway LOS Results
Stratford House PlaceMarket Street
Baron Cameron Avenue
No-Build
New Dominion Parkway
*Pedestrian Signal
Bluemont Way
Sunset Hills Road
WB DTR
EB DTR
Bowman Towne Drive
Stratford House Place
Market Street
Baron Cameron Avenue
Median U-Turns
Bluemont Way
Sunset Hills Road
WB DTR
EB DTR
Dual WB Left Turns
Median U-Turns
No Left Turns
New Dominion Parkway No Left Turns
No Left Turns
Bowman Towne Drive
Stratford House Place
Market Street
Baron Cameron Avenue
New Dominion Parkway
*Pedestrian Signal
Bluemont Way
Sunset Hills Road
WB DTR
EB DTR
Dual WB Left Turns
WB Left Flyover Ramp
96 Seconds 66 Seconds 66 Seconds
16 Seconds 26 Seconds 16 Seconds
38 Seconds 19 Seconds 38 Seconds
2 Seconds 32 Seconds 2 Seconds
62 Seconds 34 Seconds 62 Seconds
85 Seconds 106 Seconds 57 Seconds
36 Seconds 48 Seconds 36 Seconds
15 Seconds 16 Seconds 15 Seconds
Super Street Sunset Fly Over & Lawyers Bypass
13.7 Seconds
County of Fairfax, Virginia
Colts Neck Road Colts Neck Road
Fox Mill RoadFox Mill Road
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Reston Parkway LOS Results (Cont.)No-Build
WB DTR
EB DTR
Sunrise Valley Drive
Right In/Right Out
South Lakes Drive
Glade Drive
Lawyers Road
WB DTR
EB DTR
Right In/Right Out
No Left Turns
Sunrise Valley Drive
South Lakes Drive
Glade Drive
Lawyers Road
NB U-Turn
No NB/SB Left Turns
Median U-Turns
Median U-Turns
U-Turns
No NB Lefts
Colts Neck Road
Fox Mill Road
WB DTR
EB DTR
Sunrise Valley Drive
Right In/Right Out
South Lakes Drive
Glade Drive
No NB Lefts
36 Seconds 48 Seconds 36 Seconds
15 Seconds 16 Seconds 15 Seconds
105 Seconds 132 Seconds 105 Seconds
92 Seconds 87 Seconds 92 Seconds
50 Seconds 45 Seconds 50 Seconds
172 Seconds 81 Seconds 99 Seconds
152 Seconds 159 Seconds 151 SecondsLawyers Road
Super Street Sunset Fly Over & Lawyers Bypass
5 Seconds
47 Seconds
25 Seconds
County of Fairfax, Virginia
Reston Parkway Volumes
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• Reston Parkway is projected to carry similar volumes to Fairfax County Parkway (FCP)
2050 PM Peak Hour VolumesFairfax County
Pkwy Reston Pkwy Comparison
Sunrise Valley Drive
NB Approach 2071 1968 -103SB Approach 2586 2665 +79
Between DTR Ramps
NB 2510 2386 -124
SB 2775 3010 +235
Sunset Hills Road
NB Approach 2343 2543 +200
SB Approach 2062 2154 +92
Baron Cameron Avenue
NB Approach 2746 1650 -1096
SB Approach 1163 458 -705
County of Fairfax, Virginia
Reston Parkway Take Away
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• Reston Parkway carries a significant portion of north/south traffic in the area
• At grade mitigation to LOS E is challenging• Grade separations are not appropriate for the
area’s character• Discuss possibility of accepting locations with
LOS F along Reston Parkway• Fairfax County Parkway improvements could
improve Reston Parkway
County of Fairfax, Virginia
Next Steps• Advisory Group Meeting Monday, September 12• Tier 3 VISUM Analysis
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County of Fairfax, Virginia
Schedule
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Task Description 2015 May 15 June 15 July 15 Aug 15 Sep 15 Oct 15 Nov 15 Dec 15 Jan 16 Feb 16 Mar 16 April 16 May 16 June 16 July 16 Aug 16 Sep 15 Oct 15 Nov 16 Dec 16 Jan 17
1A Land Use and Networks - Task is Complete
1B Traffic Counts - Task is Complete
2A Establish Existing Conditions - Task is Complete
2B Calibrate Against Existing Conditions - Task is Complete
3A2 Analyze Future Conditions (2050) - Task complete advance to Tier 3 Mitigation
3A1 Analyze Future Conditions (2030)
3B Simulation of the Dulles Toll Road
4A Meetings/Presentations
5A Phasing Analysis - Existing Conditions- Ths Task is complete
5B Phasing Analysis - 2050 - Optional
6 Determination of DRPT Guidelines Roadway Classification
7 Documentation
8 Reston Parkway Capacity Improvements
9 Fairfax County Parkway & Spring Street Interchange
10 Fairfax County Parkway & Sunrise Valley Drive
11 Rock Hill Bridge at Sunrise Valley Drive
12A Meetings/Presentations
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08/8/16
County of Fairfax, Virginia
Discussion• Fairfax County Parkway & Spring Street
– Staff recommends Option 1• Fairfax County Parkway & Sunrise Valley Drive
– Alternatives are Comparable• Reston Parkway
– Discussion of alternatives and possible approach– Possible ideas on how to improve Reston Parkway
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County of Fairfax, Virginia
Questions & Comments
For questions and comments about the study please contact:
Kristin Calkins: [email protected](703) 877-5710
http://www.fairfaxcounty.gov/fcdot/restonnetworkanalysis/
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