Reston Network Analysis Community Meeting 2050 Results and Funding Plan: Nov. 7, 2016

County of Fairfax, Virginia
Reston Network Analysis
Community Meeting
2050 Results & Funding Plan
November 7, 2016
Kristin Calkins
Fairfax County Department of Transportation

Agenda
• Purpose of the Study
• Network Analysis Process
• 2050 Results
• Next Steps
• Question & Answer
Department of Transportation
2

Purpose of Study
• Conduct a detailed analysis of the grid of streets and
determine
– A finalized grid of streets
– Number of lanes between and at intersections
– How to best accommodate transit, bikes, and pedestrians
– Right-of-way needs
• Assign urban street types and modal emphasis
based on the Urban Street Standards from the
Department of Rail and Public Transportation
• Conduct a phasing analysis of when larger projects
are needed
3

4
Study Area

How we got here:
Reston Phase I Plan Amendment
5

Need for Study
6
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.
• The task force was comprised of 25 primary members that included
residents and representatives from Reston communities,
developments, and County staff.
• 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.”

Need for Study (Cont.)
Follow-on Study to the Reston Phase I Plan Amendment
7

Transportation Recommendations
8
• Maintain a balance between land use and transportation
• Ensure pedestrian mobility throughout the TSAs
• Bike Master Plan for County has been adopted and
includes the TSAs
• An enhanced RIBS and Fairfax Connector service to
support rail
• Strong Transportation Demand Management (TDM)
program in the TSAs

Major Road Transportation Recommendations
9
• 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

10
Grid of Streets

Reston Network Analysis
11

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

Transit Oriented Development
• Mixed-use walkable
development around
Metrorail stations
• Supported by strong
Transportation Demand
Management (TDM)
program
• Enhanced pedestrian facilities
• Increased transit ridership
• More bike parking and access
• Encourages carpooling
• Teleworking
13
Development
2050 Peak Hour – Future Trips
0 to ¼ Mile
¼ to ½
Mile
Beyond
½ Mile
Office 45% 40% 35%
Residential 45% 40% 25%
Technological
Advancement
7.5% 7.5% 7.5%
TDM Vehicle Trip Reduction Goals
Reductions are from ITE Trip Generation Rates

Evaluating the Grid
• Level of Service and Delay at Intersections
• LOS E (55 – 80 seconds of delay) or better is the
standard for the Reston Transit Station Areas agreed to
by VDOT and FCDOT
• Queue Length (number of cars waiting at a signal)
• Walksheds – pedestrian accessibility
• Enhanced connectivity for transit
14

Achieving LOS E: Mitigation
• Mitigation reduces vehicle congestion
• Mitigation reduces delays experienced at
intersections
• Mitigation improves the reliability of travel times
through an area (for both buses and vehicles)
• Mitigation will be the way to achieve LOS E or
better in the Transit Station Areas
• Using mitigation measures that have the lowest
impact
15

Mitigation
16

Mitigation Options
• Mitigation Measures - Tiered Approach
– 1st Tier: No right of way (ROW) impact
– 2nd Tier: Limited right of way impact
– 3rd Tier: Large scale mitigations if needed
– Consultation with Advisory Group, Stakeholders,
and citizens on all Tier 3 measures
• Each grid link is initially assumed to
be one lane in each direction
– No turn lanes were initially assumed at new
intersections
17
Additional coordination will be needed with VDOT on the
location of turn lanes at signalized intersections

2050 Mitigation Measures
• Tier 1 (no ROW impacts)
– Modifications to lane configurations
– Signal timing and phasing optimization
– All-way stop vs. two-way stop evaluation
– Additional traffic signals
• Tier 2 (limited ROW impacts
– Turn lanes: left and right turn lanes
– Additional through lane(s)
– Additional grid link(s)
18

2050 Intersection Control
19

Problem Locations
20
• 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 help staff understand
where more effort would be needed to
mitigate the transportation issues.

21
2050 Unmitigated Problem Locations

2050 Problem Locations
22
Intersections – 120+ Seconds of Delay
Intersections
2050 Unmitigated
After 2050
1st Tier
After 2050
2nd Tier
20 10 7
With signal re-timings, new signals, and new
turn lanes there was a reduction in the
projected number of intersections with delays
in excess of 120 seconds
After Tier 2: 7 Problem Locations 1 was in the Innovation TSA, which has already
been finalized, 6 were associated with identified follow-on tasks
• Fairfax County Parkway & Spring Street
• Fairfax County Parkway & Sunrise Valley Drive
• Reston Parkway: From Lawyers Road to Baron Cameron Avenue

Network Analysis Follow-On Tasks
Fairfax County
Pkwy. & Spring St.
Reston Pkwy.
Capacity Improvements
Fairfax County Pkwy.
& Sunrise Valley Dr.
23
Graphic from Reston Network Analysis Scope

2050 3rd Tier
Recommendations
24

Tier 3 Alternatives Analysis
• Proposed options for Tier 3 mitigation were coordinated
and developed with the Advisory Group and
Stakeholders Group for:
– Reston Parkway
– Fairfax County Parkway & Spring Street/Sunset Hills Road
– Fairfax County Parkway & Sunrise Valley Drive
• Options were tested and evaluated based on LOS, cost,
ROW need and context
• The 2050 Tier 3 model incorporated the recommended
improvements for each of the follow-on tasks
25

Reston Parkway:
Proposed Lawyers Road Connection
26
Remove Left
Turn Bays
New
Intersection
x
x
Realigned
Road

Fairfax County Parkway:
Proposed Fairbrook Drive Ramp
27

Fairfax County Parkway
Proposed Single Point Urban Interchange
28
Baron Cameron & Fairfax County Parkway

29
2050 Unmitigated Problem Locations

30
2050 1st Tier Problem Locations

31
2050 2nd Tier Problem Locations

2050 3rd Tier Problem Locations
32

2050 Problem Locations
33
Intersections – 120+ Seconds of Delay
Intersections
2050
Unmitigated
After 2050
1st Tier
After 2050
2nd Tier
After 2050
3rd Tier
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 included in the analysis of the Innovation TSA,
there is ongoing evaluation of the improvements at this loation.

Tier 3 LOS F Intersections
• Problem Locations were identified to help track
the progress of mitigation measures
• LOS E (55 – 80 seconds of delay) or better is the
standard for the Reston Transit Station Areas
agreed to by VDOT and FCDOT
• Goal of study is to have no intersections
operating at LOS F
• Key intersections, where major roads intersect,
were used to identify LOS F intersections
34

Tier 3 LOS Results
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 1st Tier
After
2050 2nd Tier
After
2050 3rd Tier
Total 24 11 9 5
35

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
• Reston Parkway at South Lakes Drive
– 95 seconds in AM
• Reston Parkway at Sunset Hills Road
• Centreville Road at Sunrise Valley Drive
– Innovation TSA
36

Next Steps
• 2050 Phasing Analysis of major projects
• 2050 detailed analysis of the Dulles Toll Road
• 2030 interim analysis of network
• Classification of grid links using DRPT Urban Street
Guidelines
37

Schedule
38
Task Description 2015 May 15 June 15 July 15 Aug 15 Sep 15 Oct 15 Nov 15 Dec 15 Jan 16 Feb 16 Mar 16 April 16 May 16 June 16 July 16 Aug 16 Sep 15 Oct 15 Nov 16 Dec 16 Jan 17
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
11/7/16

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/
39

Reston Network Analysis Community Meeting 2050 Results and Funding Plan: Nov. 7, 2016

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Reston Network Analysis Community Meeting 2050 Results and Funding Plan: Nov. 7, 2016