Reston Network Analysis Umitigated Results: Jan. 11, 2016

County of Fairfax, Virginia

Reston Network Analysis2050 Unmitigated Results

January 11, 2016

Kristin CalkinsFairfax County Department of Transportation


Agenda

• Study Purpose• Project Progress Overview• Methodology• 2050 Unmitigated Modeling Results• Mitigation Options• Next Steps• Questions and Answers2


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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Reston Network Analysis Tasks1. Data Collection – done2. Existing Conditions – done3. Future Conditions – 2050 unmitigated underway

– Determine Grid of Streets

4. Phasing Analysis 5. DRPT Classifications6. Specific location improvements for additional study

– Reston Parkway– Sunrise Valley Drive @ Fairfax County Parkway– Spring Street @ Fairfax County Parkway– Rock Hill Bridge

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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


Project Progress Overview • Completed data collection• Finalized existing conditions • Begun analyzing future conditions (2030

& 2050)– Developed ITE-based vehicle trips for 2030 and 2050

• Significant vehicle trip reductions due to transit, TDM, and bike and pedestrian increases associated with the Metro station and TOD development

– Developed the 2050 VISUM model – Completed 2050 VISUM preliminary vehicle trip

assignment without mitigation6


Methodology• County model

– Seed trip tables– Roadway network

• VISUM– Model development including local roads & driveways

• VISUM model input– Origin/Destination (O-D) trip tables from County and Regional Model– ITE-based trips– SYNCHRO for signal timing optimization

• VISUM model output– Intersection delay and level of service– Link volumes– Turning movements volumes and LOS

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Reston VISUM Model

Tysons

Reston

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2050 UnmitigatedVISUM Modeling Results

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2050 Unmitigated Results• Stop controlled intersections:

– Overall LOS– Overall Delay

• Signalized intersections:– Overall LOS– Overall Delay– LOS by movement– Delay by movement– Volumes for each movement

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LOS Results• Of 42 key signalized intersections in the study area,

in 2050 unmitigated the following operate at Level of Service F:– AM peak hour: 24– PM peak hour: 26– AM and PM peak hours: 22

• Existing development is 31,812,244 square feet• 2050 development is approximately 100,000,000

square feet (including Innovation TSA)

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Existing Peak Hour LOS (Page 1)

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2050 Unmitigated Peak Hour LOS (Page 1)

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LOS Results

• Intersections with delay of 120 seconds or more– AM peak hour: 17– PM peak hour: 19– AM and PM peak hours: 14

• LOS E is the standard for the Reston Transit Station Areas

Delay (s/veh)

LOSSignalized

IntersectionsUnsignalized Intersections

A ≤ 10 ≤ 10

B > 10 - 20 10 - 15

C > 20 - 35 15 - 25

D > 35 - 55 25 - 35

E > 55 - 80 35 - 50

F > 80 ≥50

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2050 Unmitigated Problem Locations

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2050 Unmitigated Problem Locations (cont.)

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• Intersections with Delay over 120 Seconds1. Frying Pan Road & Sunrise Valley Drive2. Frying Pan Road & Centreville Road3. Centreville Road & Sunrise Valley Drive4. Centreville Road & the Eastbound DTR Ramps5. Centreville Road & the Westbound DTR Ramps (PM only)6. Monroe Street & Fox Mill Road (AM only)7. Monroe Street & Sunrise Valley Drive (PM only)8. Spring Street & Herndon Parkway9. Fairfax County Parkway & Sunrise Valley Drive10. Fairfax County Parkway & New Dominion (PM only)11. Fairfax County Parkway & Baron Cameron Avenue



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• Intersections with Delay over 120 Seconds12. Town Center Parkway & Baron Cameron Avenue 13. Town Center Parkway & Sunset Hills Road14. Reston Parkway & Baron Cameron Avenue15. Reston Parkway & Sunset Hills Road16. Reston Parkway & Sunrise Valley Drive 17. Reston Parkway & South Lakes Drive18. Sunrise Valley Drive & Soapstone Drive (PM only)19. Wiehle Avenue & Eastbound DTR Ramps (AM only)20. Hunter Mill Road & Sunrise Valley Drive (AM only)21. Hunter Mill Road & Westbound DTR Ramps 22. Hunter Mill Road & Sunset Hills Road (PM only)


2050 Unmitigated Data• Stop controlled intersections:

– Overall LOS– Overall Delay

• Signalized intersections:– Overall LOS– Overall Delay– LOS by movement– Delay by movement– Volumes for each movement

• Link volumes• Driveway volumes

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2050 AM Peak Hour Data

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PM 2050 Peak Hour Data

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2050 AM Peak Hour Data

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2050 PM Peak Hour Data

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AM Peak Hour Site Trips and Link Volumes

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PM Peak Hour Site Trips and Link Volumes

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Existing Reston TSA Walk-shed

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2050 Reston TSA Walk-shed

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2050 Walkshed

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Distance Existing With Grid Increase0-.25 mile 0.06 0.10 66%

.25 - 0.5 mile 0.22 0.46 108%.05-1.0 mile 1.86 2.52 35%

Total 2.15 3.09 44%

Walkshed Area (square mile)


Mitigation• Mitigation reduces vehicle congestion • Mitigation reduced delays experienced at

intersections• Mitigation improves the reliability of travel times

through an area (for both buses and vehicles)

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Mitigation Options• Mitigation Measures - Tiered Approach

– No right of way impact – Some right of way impact– Large scale mitigations if needed

– Consultation with Advisory Group and Stakeholders

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Mitigation MeasuresNo Right of Way Impact

•No/Low Cost: Intersection Reconfiguration– Optimized signal timing and phasing– Lane configuration modification

Westwood Center Dr. @ Route 7 (2013)

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Westwood Center Dr. @ Route 7 (2015)


Mitigation Measures (cont.)No Right of Way Impact

•Existing and Potential Future Signals– Adding/removing traffic signals– Adding/modifying stop control

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Westwood Center Dr. @ Sheraton Tysons Dr. (2013)

Westwood Center Dr. @ Sheraton Tysons Dr. (2015)


Mitigation MeasuresSome Right of Way Impact

• Turn lanes– Left and Right turn lanes– Add storage– Reduces queuing on to through movement

• Additional through lane• Additional grid link

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Mitigation MeasuresAlternative Intersection Treatment

• Median U-Turn/Superstreet– Eliminate left turn movement for side streets– Increases thru movement green time– Additional needed ROW to provide turn radius

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Mitigation MeasuresLarge Mitigation Measures

• Underpass/Overpass– Provides for an uninterrupted thru movement

• Only done in close coordination with Advisory Group and Stakeholders after all other mitigation measures have not worked

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Next Steps• Apply no ROW impact Mitigation Measures

– Modifications to the lane configuration– Signal timing and phasing optimization – All-way stop vs. two-way stop evaluation – Additional traffic signals

• Meet with Stakeholder Group on no ROW impact Mitigation Measure LOS Results

• Develop possible mitigation measures for problem locations that remain to discuss with Advisory Group

• Meet with Advisory Group on possible some-ROW impact mitigation measures

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ScheduleTask Description

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)

3A1 Analyze Future Conditions (2030)

3B Simulation of the Dulles Toll Road

3C Microsimulation - Optional

4A Meetings/Presentations

5A Phasing Analysis - Existing Conditions

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

Feb-15May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Sep-16 Oct-16Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16

1/11/16

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Questions & Comments

For questions and comments about the study please contact:

Kristin Calkins: [email protected](703) 877-5710

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Government & Nonprofit

Reston Network Analysis Umitigated Results: Jan. 11, 2016