reston network analysis unmitigated results: jan.15, 2016

County of Fairfax, Virginia

Reston Network Analysis2050 Unmitigated Results

January 15, 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

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

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

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

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

Reston VISUM Model

Tysons

Reston

2050 UnmitigatedVISUM Modeling Results

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

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)

Existing Peak Hour LOS (Page 1)

2050 Unmitigated Peak Hour LOS (Page 1)

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

2050 Unmitigated Problem Locations

2050 Unmitigated Problem Locations (cont.)

• 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

• 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

2050 AM Peak Hour Data

PM 2050 Peak Hour Data

2050 AM Peak Hour Data

2050 PM Peak Hour Data

AM Peak Hour Site Trips and Link Volumes

PM Peak Hour Site Trips and Link Volumes

Existing Reston TSA Walk-shed

2050 Reston TSA Walk-shed

2050 Walkshed

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)

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

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)

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

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

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

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

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

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

Questions & Comments

For questions and comments about the study please contact:

Kristin Calkins: Kristin.Calkins@fairfaxcounty.gov(703) 877-5710

http://www.fairfaxcounty.gov/fcdot/restonnetworkanalysis/

reston network analysis unmitigated results: jan.15, 2016

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