Reston Network Analysis Umitigated Results: Jan. 11, 2016

1. County of Fairfax, Virginia Reston Network Analysis 2050 Unmitigated Results January 11, 2016 Kristin Calkins Fairfax County Department of Transportation

2. County of Fairfax, Virginia Agenda • Study Purpose • Project Progress Overview • Methodology • 2050 Unmitigated Modeling Results • Mitigation Options • Next Steps • Questions and Answers 2

3. 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 3

4. County of Fairfax, Virginia Reston Network Analysis Tasks 1. Data Collection – done 2. Existing Conditions – done 3. Future Conditions – 2050 unmitigated underway – Determine Grid of Streets 4. Phasing Analysis 5. DRPT Classifications 6. Specific location improvements for additional study – Reston Parkway – Sunrise Valley Drive @ Fairfax County Parkway – Spring Street @ Fairfax County Parkway – Rock Hill Bridge 4

5. 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 • Prioritization of larger projects Network Analysis Project Process Advisory Group input, Stakeholder input, Community input

6. County of Fairfax, Virginia 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 mitigation 6

7. County of Fairfax, Virginia 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 7

8. County of Fairfax, Virginia Reston VISUM Model Tysons Reston 8

9. County of Fairfax, Virginia 2050 Unmitigated VISUM Modeling Results 9

10. County of Fairfax, Virginia 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 10

11. County of Fairfax, Virginia 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) 11

12. County of Fairfax, Virginia Existing Peak Hour LOS (Page 1) 12

13. County of Fairfax, Virginia 2050 Unmitigated Peak Hour LOS (Page 1) 13

18. County of Fairfax, Virginia 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) LOS Signalized Intersections Unsignalized 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 18

19. County of Fairfax, Virginia 2050 Unmitigated Problem Locations 19

20. County of Fairfax, Virginia 2050 Unmitigated Problem Locations (cont.) 20

21. County of Fairfax, Virginia 2050 Unmitigated Problem Locations (cont.) 21

22. County of Fairfax, Virginia 2050 Unmitigated Problem Locations (cont.) 22 • Intersections with Delay over 120 Seconds 1. Frying Pan Road & Sunrise Valley Drive 2. Frying Pan Road & Centreville Road 3. Centreville Road & Sunrise Valley Drive 4. Centreville Road & the Eastbound DTR Ramps 5. 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 Parkway 9. Fairfax County Parkway & Sunrise Valley Drive 10. Fairfax County Parkway & New Dominion (PM only) 11. Fairfax County Parkway & Baron Cameron Avenue

23. County of Fairfax, Virginia 2050 Unmitigated Problem Locations (cont.) 23 • Intersections with Delay over 120 Seconds 12. Town Center Parkway & Baron Cameron Avenue 13. Town Center Parkway & Sunset Hills Road 14. Reston Parkway & Baron Cameron Avenue 15. Reston Parkway & Sunset Hills Road 16. Reston Parkway & Sunrise Valley Drive 17. Reston Parkway & South Lakes Drive 18. 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)

24. County of Fairfax, Virginia 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 24

25. County of Fairfax, Virginia 2050 AM Peak Hour Data 25

26. County of Fairfax, Virginia PM 2050 Peak Hour Data 26

27. County of Fairfax, Virginia 2050 AM Peak Hour Data 27

28. County of Fairfax, Virginia 2050 PM Peak Hour Data 28

29. County of Fairfax, Virginia AM Peak Hour Site Trips and Link Volumes 29

30. County of Fairfax, Virginia PM Peak Hour Site Trips and Link Volumes 30

31. County of Fairfax, Virginia Existing Reston TSA Walk-shed 31

32. County of Fairfax, Virginia 2050 Reston TSA Walk-shed 32

33. County of Fairfax, Virginia 2050 Walkshed 33 Distance Existing With Grid Increase 0-.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)

34. County of Fairfax, Virginia 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) 34

35. County of Fairfax, Virginia 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 35

36. County of Fairfax, Virginia Mitigation Measures No Right of Way Impact •No/Low Cost: Intersection Reconfiguration – Optimized signal timing and phasing – Lane configuration modification Westwood Center Dr. @ Route 7 (2013) 36 Westwood Center Dr. @ Route 7 (2015)

37. County of Fairfax, Virginia Mitigation Measures (cont.) No Right of Way Impact •Existing and Potential Future Signals – Adding/removing traffic signals – Adding/modifying stop control 37 Westwood Center Dr. @ Sheraton Tysons Dr. (2013) Westwood Center Dr. @ Sheraton Tysons Dr. (2015)

38. County of Fairfax, Virginia Mitigation Measures Some 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 38

39. County of Fairfax, Virginia Mitigation Measures Alternative 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 39

40. County of Fairfax, Virginia Mitigation Measures Large 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 40

41. County of Fairfax, Virginia 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 41

42. County of Fairfax, Virginia Schedule Task 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 42

43. County of Fairfax, Virginia Questions & Comments For questions and comments about the study please contact: Kristin Calkins: Kristin.Calkins@fairfaxcounty.gov (703) 877-5710 43