Reston Network Analysis: Mid-Buildout Results and Roadway Classifications- April 24, 2017

1. County of Fairfax, Virginia
1
Reston Network Analysis
Mid-Buildout Results & Roadway
Classifications
April 24, 2017: Public Meeting
Kristin Calkins
Fairfax County Department of Transportation

2. County of Fairfax, Virginia
Agenda
• Study Purpose
• Project Progress Overview
• 2050 Network & Results
• Project Prioritization
• Mid-buildout Network & Results
• Grid of Streets – Roadway Classifications
• Next Steps
• Questions and Answers
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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 to estimate when
larger projects are needed
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4. 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
Phasing
Analysis
• Prioritization
of larger
projects
Finalize Grid of
Streets (2030
& 2050)
Based on:
• Advisory Group
input
• Stakeholder
input
• Community
input
Network Analysis Project Process
Advisory Group input, Stakeholder input, Community input
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We are
Here

5. County of Fairfax, Virginia
Need for Study
Department of Transportation
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The Reston Master Plan Special Study was a two-phase planning
study to identify changes to the Fairfax County Comprehensive Plan to
help guide future development in the planned community of Reston and
adjoining areas located along the Dulles Airport Access and Toll Road.
• The study began in 2009 and concluded in June 2015 after robust
and thoughtful community discussions and participation.
• A Task Force, comprised of 25 primary members, representing
residents, Reston community groups, and property owners guided
the study.
• The Board Follow-On Motion from the adoption directed staff to:
– “conduct a detailed evaluation and operational analysis of the enhanced street
network shown on the Reston Master Plan, prioritize these improvements, and
develop an implementation strategy.”

6. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Transportation Guidance
Department of Transportation
6
• Maintain a balance between land use and transportation
• Ensure pedestrian mobility throughout the Transit Station
Areas (TSAs)
• Implement the Bike Master Plan for the County, which
includes the TSAs
• Accommodate an enhanced RIBS and Fairfax Connector
service to support rail
• Establish a strong Transportation Demand Management
(TDM) program in the TSAs

7. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Major Road Transportation Recommendations
Department of Transportation
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• An enhanced street network
to increase connectivity
– Developed by the Reston Task
Force
• Soapstone Drive Overpass
• Town Center Parkway
Underpass
• South Lakes Drive Overpass
• Grade Separate Fairfax
County Parkway/Sunrise
Valley Drive

8. County of Fairfax, Virginia
2050 Network & Results
(Presented November 7, 2016)
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9. County of Fairfax, Virginia
Analyzing the Grid
• Mitigation was used to achieve Level of Service
(LOS) E or better in the Transit Station Areas
• Mitigation Measures - Tiered Approach
– Tier 1: No Right-of-Way (ROW) impact
– Tier 2: Limited ROW impact
– Tier 3: Large scale mitigations if needed
• Each grid link was initially assumed to be one
lane in each direction (with bike/ped facilities as
specified in the Comprehensive Plan)
Department of Transportation
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10. County of Fairfax, Virginia
2050 (Full Buildout) Network
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11. County of Fairfax, Virginia
Full Buildout Network
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• All grid links remain one lane in each direction
• Widening of Fairfax County Parkway to 6 lanes w/ HOV
as lanes 5 & 6
• South Lakes Overpass at Dulles Toll Road
• Soapstone Overpass at Dulles Toll Road
• Town Center Underpass at Dulles Toll Road
• Interchange improvements on Fairfax County Parkway
at
– Sunrise Valley Drive
– Spring Street
• Extension of Pinecrest Road

12. County of Fairfax, Virginia
Full Buildout Network (Cont.)
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• Widening of Fox Mill Road: Reston Parkway to Monroe Street
• Widening of West Ox Road: Lawyers Road to Centreville
Road
• Loop road through Reston South Park & Ride: Reston
Parkway to Lawyers Road
• Rock Hill Road Overpass at DTR
• Extension of McLearen Road: West Ox Road to Reston
Parkway
• Widening of Monroe Street from Fox Mill Road to Town of
Herndon
• Reston Parkway Widening: South Lakes Drive to DTR

13. County of Fairfax, Virginia
Full Buildout Network - Signals
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14. County of Fairfax, Virginia
Problem Locations
Department of Transportation
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• Problem Locations were identified to help
track the progress of mitigation measures
• 120 seconds of delay was used to identify a
problem location
– LOS E is 80 seconds and 120 seconds
represents 50% more delay than what is
acceptable in the Reston TSAs.
• Problem locations helped staff understand
where more effort would be needed to
mitigate the transportation issues.

15. County of Fairfax, Virginia
Department of Transportation
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2050 Unmitigated Problem Locations

16. County of Fairfax, Virginia
Department of Transportation
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2050 Tier 1 Problem Locations

17. County of Fairfax, Virginia
Department of Transportation
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2050 Tier 2 Problem Locations

18. County of Fairfax, Virginia
2050 Tier 3 Problem Locations
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19. County of Fairfax, Virginia
Problem Locations Summary
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Intersections – 120+ Seconds of Delay
Intersections
2050
Unmitigated
After 2050
Tier 1
After 2050
Tier 2
After 2050
Tier 3
20 10 7 1*
With Tier 3 mitigations a significant reduction in
the projected number of intersections
experiencing delays in excess of 120 seconds
can be seen.
*Centreville Road & Sunrise Valley Drive: PM 138 seconds in Innovation TSA.
• The intersection was also included in the analysis of the Innovation
TSA. There is ongoing evaluation of the improvements at this location.

20. County of Fairfax, Virginia
LOS F Intersections Summary
Of the 42 key signalized intersections on the major roadways
in the Reston TSA, only 5 continue to have 80 seconds of
delay or greater after Tier 3 Mitigation.
42 Key Intersections – LOS F
Peak Hour
2050
Unmitigated
After 2050
Tier 1
After 2050
Tier 2
After 2050
Tier 3
Total 24 11 9 5
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21. County of Fairfax, Virginia
Tier 3 LOS F Intersections
• Fairfax County Parkway at Baron Cameron Avenue
– 100 seconds of delay in the PM
• Reston Parkway at Sunrise Valley Drive
– 92 seconds of delay in the PM
• Reston Parkway at South Lakes Drive
– 95 seconds of delay in the AM
• Reston Parkway at Sunset Hills Road
– 83 seconds of delay in the PM
• Centreville Road at Sunrise Valley Drive
– 138 seconds of delay in the PM (Innovation TSA)
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22. County of Fairfax, Virginia
Project Prioritization
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23. County of Fairfax, Virginia
Phasing Analysis
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• Conducted for Existing Conditions and Full
Buildout
– AM and PM peak hours
• Showed which projects had the greatest
benefit in each scenario
• Showed hours saved during the peak hours
• Used in project prioritization

24. County of Fairfax, Virginia
Inputs to Project Prioritization
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• Phasing Analysis Results
– Time Savings Benefit in near-term and at Plan Buildout
• Community Input
• Project Readiness
• Balanced Funding throughout the plan
horizon

25. County of Fairfax, Virginia
Project Prioritization
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Priority 1
1. Soapstone Overpass
2. Town Center Underpass
3. Reston Parkway Widening
4. Fairfax County Parkway Widening (West Ox to the Dulles Toll Road)
Priority 2
1. Sunrise Valley Drive/Fairfax County Parkway Interchange
2. South Lakes Overpass
3. Fox Mill Road Widening
Priority 3
1. West Ox Road Widening
2. Monroe Street Widening
3. Pinecrest extension

26. County of Fairfax, Virginia
Mid-Buildout
Network & Results
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27. County of Fairfax, Virginia
Mid-Buildout Scenario
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• 2030 is a representation of the ‘mid-buildout’
of the Reston TSAs
• Assumptions about development levels were
provided by the Department of Planning and
Zoning (DPZ)
• Analysis indicates where improvements may
be needed to support a midpoint in
development

28. County of Fairfax, Virginia
Assumed Mid-Buildout Improvements
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• Roadways:
– Soapstone Connector
– Town Center Parkway Underpass
– Reston Parkway – 6 lanes from DTR to South
Lakes Drive
• Intersection Modifications:
– Reston Parkway & Sunrise Valley Drive
– Reston Parkway & South Lakes Drive
– Reston Parkway & Baron Cameron Avenue

29. County of Fairfax, Virginia
Assumed Mid-Buildout Improvements (Cont.)
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• New Signals:
– Town Center Parkway north of Sunset Hills Road
– New Dominion Parkway and Explorer Street
– Soapstone Connector and Sunset Hills Road
– Reston Station Boulevard Extended and Sunset
Hills Road
– Sunrise Valley Drive and Town Center Parkway

30. County of Fairfax, Virginia
Assumed Mid-Buildout Grid
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31. County of Fairfax, Virginia
Estimated Mid-Buildout LOS F Intersections
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• Fairfax County Parkway at Sunrise Valley Drive
– 132 seconds of delay in the AM
• Sunset Hills Road at Town Center Parkway
– 123 seconds of delay in the AM
• Reston Parkway at South Lakes Drive
– 143 seconds of delay in the AM
• Sunrise Valley Drive at Hunter Mill Road
– 121 seconds of delay in the AM
• Sunset Hills Road at Hunter Mill Road
– 87 seconds of delay in the AM
• Sunrise Valley Drive at Preston White Drive/South Lakes Drive
– 113 seconds of delay in the PM

32. County of Fairfax, Virginia
Estimated Mid-Buildout LOS F Intersections
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33. County of Fairfax, Virginia
Mid-Buildout Scenario Summary
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• Only six intersection operate at LOS F
• Improvements in place by 2050 will result in
improved LOS
• County staff will continue to assess
transportation and development in Reston and
will modify recommendations as necessary
• Annual review with the Reston Transportation
Service District Advisory Board

34. County of Fairfax, Virginia
Street Standards/
Multimodal System Design
Guidelines
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35. County of Fairfax, Virginia
Roadway Classifications
• Roadways are classified by their character and
what type of trips they serve
• These trips include vehicle, pedestrian, bike and
transit trips
• Roadway classifications are influenced by the
context of the road’s built environment
– Commercial
– Residential
– Mixed Use
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36. County of Fairfax, Virginia
Roadway Classifications: Elements
• Roadway
Classifications
provide guidance
on:
– Medians
– Travel lanes
– Bike Lanes
– On-Street Parking
– Landscape Amenity
Panels (LAP)
– Sidewalks
– Building Frontages
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37. County of Fairfax, Virginia
Roadway Classifications: Types
• Through Corridor
– Higher speed corridor that connects multiple activity centers.
– Speed limit: 35 – 55 mph
• Boulevard
– Carry high volumes of traffic and allow for greater vehicle volumes.
– Speed limit: 30 – 35 mph
• Major Avenue
– Contain the highest density of destinations, intensity of activity, and
mix of modes. Have major pedestrian and street activity.
– Speed limit: 30 – 35 mph
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38. County of Fairfax, Virginia
Roadway Classifications: Types (Cont.)
• Avenue
– Provide a balance between access to business and residences that
front them, carry both vehicle and pedestrian traffic. Pedestrian and
bicycle activity is very common as Avenues serves as critical links in
the non-motorized transportation network. Avenues are low speed
roadways.
– Speed limit: 25 – 35 mph
• Local Street
– Have the lowest speeds and highest access to land use. Local
Streets are primarily residential.
– Speed limit: 25 mph
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39. County of Fairfax, Virginia
Roadway Classifications Examples
• Through Corridor
– Example: Fairfax County Parkway
• Boulevard
– Example: Baron Cameron Avenue
• Major Avenue
– Example: Sunset Hills Road & Reston Parkway
• Avenue
– Example: Town Center Parkway & Reston Station Boulevard
• Local Street
– Example: Market Street & Explorer Street
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40. County of Fairfax, Virginia
Grid of Streets Roadway
Classifications
The Grid of Streets analyzed in the Reston Network Analysis
have been classified as either Avenue or Local
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Example Avenue

41. County of Fairfax, Virginia
Next Steps
• Public Comment
• Documentation
• Final Report Summer 2017
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42. County of Fairfax, Virginia
Schedule
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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) - 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
07
4/174/24

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