This document provides an overview of the Reston Network Analysis study being conducted by the Fairfax County Department of Transportation. The study aims to analyze and optimize the conceptual grid of streets planned for the Reston Transit Station Areas to determine road design and accommodate different transportation modes. It will involve collecting data, modeling existing and future traffic conditions, engaging stakeholders, and selecting improvements. The analysis will be conducted over 12 months to refine the street grid and integrate it into the comprehensive plan.

1. County of Fairfax, Virginia
Department of Transportation
Reston Network Analysis
Stakeholder Kick-off Meeting
December 12, 2014

2. County of Fairfax, Virginia
Department of Transportation
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3. County of Fairfax, Virginia
Department of Transportation
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Study Area

4. County of Fairfax, Virginia
Need for Study
Follow-on Study to the Reston Phase I Plan Amendment
Department of Transportation
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5. County of Fairfax, Virginia
Reston Districts

6. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Planning Principles (1)
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1. Excellence in planning, urban design and architecture
will be community hallmarks
2. Planning will provide for environmental sustainability and
green technology
3. Development will be phased with infrastructure
4. Reston will continue to offer a mix of urban and
suburban lifestyles
5. The Rail Corridor will be transformed

7. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Planning Principles (2)
Department of Transportation
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6. Reston will become a more vibrant employment center
7. Housing will be provided for all ages and incomes
8. Connectivity and mobility will be strengthened
9. High quality public open spaces will be required
10.Public participation in planning and zoning will continue
to be the community’s foundation

8. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Planned Development Potential
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Land Use
2010 Existing Land Use
(sq. ft.)
Development Potential
(sq. ft.)
Residential 5,860,000 (5,860 Units) 33,480,000 (27,900 Units)
Office 20,982,169 29,457,000
Retail 1,094,476 1,722,000
Industrial 841,957 513,000
Institutional 2,096,840 2,174,000
Hotel 936,782 3,399,000
Total 31,812,224 70,745,000
Reston TSA Comprehensive Plan Development Potential

9. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Transportation Recommendations
Department of Transportation
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• Transportation study was done to determine what
transportation improvements are needed to support the
planned development in the TSAs
• Specific recommendations were made to enhance the
transportation network
• Recommended, but did not analyze and optimize the
conceptual grid of streets

10. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Intersection Analysis Results
Department of Transportation
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• 2013 Existing:
o AM – 6 intersections fail, 3 LOS E
o PM – 7 intersections fail, 2 LOS E
• 2030 COG Round 8 (with Transportation Plan):
o AM – 11 intersections fail, 4 LOS E
o PM – 10 intersections fail, 5 LOS E
• 2030 Scenario G (with mitigation):
o AM – 6 intersections fail, 4 LOS E
o PM – 6 intersections fail, 3 LOS E

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

12. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Major Transportation Recommendations
Department of Transportation
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• Maintain a Balance between land use and transportation
• Ensure pedestrian mobility throughout the TSAs
• Bike master plan for County, including the TSAs has
been adopted
• An enhanced RIBS service to support rail
• Strong Transportation Demand Management (TDM)
program in the TSAs

13. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Analysis Area
Department of Transportation
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14. County of Fairfax, Virginia
Department of Transportation
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Reston Phase I Plan Amendment
Grid of Streets

15. County of Fairfax, Virginia
Reston Phase I Plan Amendment
Grid of Streets
Department of Transportation
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• Conceptual grid of streets was a result of the Reston
Task Force
• The three TSAs were examined and had conceptual grids
developed by task force members
• These grids were refined by FCDOT staff
• The conceptual grid was then included in the
comprehensive plan

16. County of Fairfax, Virginia
Department of Transportation
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Wiehle-Reston East Transit Station Area

17. County of Fairfax, Virginia
Department of Transportation
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Reston Town Center Transit Station Area

18. County of Fairfax, Virginia
Department of Transportation
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Herndon Transit Station Area

19. County of Fairfax, Virginia
Purpose of Study
• Analyze the grid of streets and determine
– Number of lanes between and at intersections
– How to best accommodate transit, bikes, and pedestrians
– Right-of-way needs
• Assign Department of Rail and Public Transportation
corridor type and multimodal emphasis
• Examine four specific problem locations
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20. County of Fairfax, Virginia
Why a Grid
A grid of streets allows for more options when going from
point A to point B, reducing the demand streets
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21. County of Fairfax, Virginia
What is a Grid
• Maximizes continuity within the grid of streets
• Avoids intersections with an acute angle, off set
intersections, and intersections with more than four legs
• Provides good pedestrian access to Metro stations
• Block sizes should generally be within a 400 foot to 600
foot range with a maximum perimeter length of 2,000 feet
• Any block longer than 600 feet should contain a mid-block
pedestrian connection
• Where possible, even spacing between intersections
should be maintained
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22. County of Fairfax, Virginia
Network Analysis
1. Data Collection
2. Existing Conditions
3. Future Conditions
– Determine Grid of Streets
1. Phasing Analysis
2. DRPT Classifications
3. Specific location improvements
– Reston Parkway
– Sunrise Valley Drive @ Fairfax County Parkway
– Spring Street @ Fairfax County Parkway
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23. County of Fairfax, Virginia
Methodology
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Macroscopic Models – Regional
Transportation Model
Public policy, regionally significant
projects
Mesoscopic Models – Sub Area
(VISUM)
Link regional trip purpose to details of
microsimulation models
Microscopic Models – Street
Traffic analysis (VISSIM)
“Visualization” of solutions, detailed
intersection operations analysis

24. County of Fairfax, Virginia
Measures of Effectiveness
• Vehicles Mile Traveled
• Hours of Delay
• Average Speed
• Travel Time
• Level of Service and Delay at Intersections
• Queue Length
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25. County of Fairfax, Virginia
Analysis Process – Tiered Approach
1. No right of way impact (signal modification, lane
restriping)
2. Some right of way impact (turn lanes, additional
through lane, additional grid link)
3. Large scale mitigations
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26. County of Fairfax, Virginia
Process with Stakeholders
• Regular meetings
• Inclusive, collaborative process
• Full access to information
• Analyze suggestions
• Many iterations of testing alternative mitigation
measures
• Focus is cost-effectiveness
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27. County of Fairfax, Virginia
Next Steps
• Select a consultant
• Meet with property owners to review conceptual grid
layouts
• Refine the Grid by incorporating stakeholder feedback
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28. County of Fairfax, Virginia
Time Line
• Anticipated to take approximately 12 months
– Finalized map of the grid of streets will be integrated into the
comprehensive plan (2016)
• Selection of consultant underway
– Will have a refined timeline at next meeting
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29. County of Fairfax, Virginia
Questions & Comments
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For questions and comments about the study please
contact:
Kristin Calkins: Kristin.Calkins@fairfaxcounty.gov
(703) 877-5710