Reston Network Analysis: Transportation Advisory Commission: July 19, 2016

County of Fairfax, Virginia
Reston Network Analysis
Transportation Advisory Commission
July 19, 2016
Kristin Calkins
Fairfax County Department of Transportation

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
Department of Transportation
2

3
Study Area

How we got here:
Reston Phase I Plan Amendment
4

Need for Study
5
• The Reston Phase I Comprehensive Plan Amendment
was adopted by the Fairfax County Board of Supervisors
on February 11, 2014.
• 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
6

Transportation Recommendations
7
• 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
8
• 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

9
Grid of Streets

Reston Network Analysis
10

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
12
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 based off of ITE Trip Generation Rates

Evaluating the Grid
• Level of Service and Delay at Intersections
• LOS E (55 – 80 seconds of delay) is the standard for the
Reston Transit Station Areas
• VDOT and FCDOT have agreed on LOS E as the
standard for the Reston Transit Station Areas
• Queue Length (number of cars waiting at a signal)
• Walksheds – pedestrian accessibility
• Enhanced connectivity for transit
13

Walksheds
14
Map 1: 2015
Walkshed
2015 Walkshed 2050 Walkshed

Mitigation
15

Purpose of 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 we achieve LOS E in the
Transit Station Areas
• We are using mitigation measures that have the
lowest impact
16

Mitigation Options
• Mitigation Measures - Tiered Approach
– 1st Tier: No right of way (ROW) impact
– 2nd Tier: Some right of way impact
– 3rd Tier: Large scale mitigations if needed
– Consultation with Advisory Group, Stakeholders, and
citizens
• 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 1st Tier
Recommendations
18

2050 1st Tier Mitigation Measures
• No ROW Impact Mitigation Measures
– Modifications to lane configurations
– Signal timing and phasing optimization
– All-way stop vs. two-way stop evaluation
– Additional traffic signals
• 40 new Signalized intersections
recommended
19

2050 2nd Tier
Recommendations
20

21
Mitigation Measures
2nd Tier: Some Right of Way Impact
• Potential some ROW Mitigation Measures
– Signals were added where needed
– Turn lanes: left and right turn lanes
– Additional through lane
– Additional grid link

2050 2nd Tier Intersection Control
22

2050 2nd Tier Recommendations
23
Turn Lanes
• Monroe St. & Frying Pan Rd./Fox Mill Rd.
• Reston Pkwy. & Sunrise Valley Dr.
• Sunset Hills Rd. &Town Center Pkwy.
• Wiehle Ave. & Reston Station Blvd.
• Wiehle Ave. & N Isaac Newton Sq.
• Monroe St. & future connection to Herndon
Metro Garage
Additional coordination will be needed with VDOT on the
location of turn lanes at signalized intersections

New Turn Lanes
24
Wiehle Ave. & N. Isaac Newton Sq.- EB left turn lane & WB right turn lane
Tier 1 Tier 2
PM: 103 sec.
PM: 65 sec.

Town of Herndon Comprehensive Plan Improvements
25
Worldgate Dr. &
Herndon Pkwy.
Monroe St. &
Worldgate Dr.
Monroe St. &
Herndon Pkwy.
Fairbrook Drive Extension Worldgate Drive Extension
New Signals
Worldgate Dr. Extension & Herndon Pkwy.
Herndon Pkwy. & Fairbrook Dr.

2050 2nd Tier Mitigation
Results
26

2nd Tier LOS Results
• Of 42 key signalized intersections in the study area,
the following are forecast operate at Level of
Service F:
27
42 Key Intersections – LOS F
Intersections
2050
Unmitigated
After 2050
1st Tier
After 2050
2nd Tier
24 13 10

2050 Problem Locations
28
Intersections – 120+ Seconds of Delay
Intersections
2050 Unmitigated
After 2050
1st Tier
After 2050
2nd Tier
20 10 7
With signal re-timings and the introduction of
signals, there has been a reduction in the
projected number of intersections experiencing
delays in excess of 120 seconds

29
2050 Unmitigated Problem Locations

30
2050 1st Tier Problem Locations

31
2050 2nd Tier Problem Locations

32
• Unmitigated had 20 Problem Locations
• After 1st Tier: 10 Problem Locations
• After 2nd Tier: 7 Problem Locations
– 6 are associated with identified follow-on tasks
1. Fairfax County Parkway & Spring Street
2. Fairfax County Parkway & Sunrise Valley Drive
3. Reston Parkway & Baron Cameron Avenue
4. Reston Parkway & Bowman Towne Drive
5. Reston Parkway & Sunrise Valley Drive
6. Reston Parkway & South Lakes Drive

33
Fairfax County
Pkwy. & Spring St.
Reston Pkwy.
Capacity Improvements
Fairfax County Pkwy.
& Sunrise Valley Dr.

3rd Tier Mitigation
34

Mitigation Measures
3rd Tier: Alternative Intersection Treatment
• Median U-Turn/Superstreet
– Eliminates left turn movement for side streets
– Increases thru movement green time
– Additional needed ROW to provide turn radius
35

Mitigation Measures
3rd Tier: 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
36

Public Involvement
37

Process with Advisory Group
• Appointed by Supervisor Hudgins
• Regular meetings: Monday evenings as
scheduled
• Sounding board for the project
• Opportunity to hear community and property
owner opinion in dialogue
• Advises staff of what community and developer
opinions on the project
38

Process with Stakeholders
• Property Owners, traffic consultants and
interested parties in the Reston Transit Station
Areas
• Regular meetings: Friday Mornings as
scheduled
• Inclusive, collaborative process
• Full access to information
39

Process with Public
• Meetings at key project milestones
• Ability to comment at public meetings and
on project website
• All other meetings are open to the public
40

Next Steps
• Identify Tier 3 Mitigation Measures for:
– Fairfax County Parkway & Sunrise Valley Drive
– Fairfax County Parkway & Spring Street
– Reston Parkway
» Intersection improvements from Baron Cameron Avenue to
Lawyers Road
• Phasing Analysis
– Based on Existing Conditions
– Based on 2050 Conditions
• Assign DRPT Multimodal Cross Sections
• Finalize 2050 Grid
• Analyze 2030 Grid
41

Schedule
42
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
3C Microsimulation - Optional
4A Meetings/Presentations
4B Additional Meetings/Presentations - Optional
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
12B Additional Meetings/Presentations - Optional
October 2016April 2016 May 2016 June 2016 July 2016 August 2016 September 2016March 2016January 2016 February 2016
07/19/16

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/
43

New Turn Lanes (Cont.)
44
Town Center Pkwy. & Sunset Hills Rd. - SB & NB left turn lanes
Tier 1 Tier 2
TownCenter
Pkwy.
Sunset Hills Rd. Sunset Hills Rd.
TownCenter
Pkwy.
AM: 106 sec.
PM: 157 sec.
AM: 41 sec.
PM: 40 sec.

New Turn Lanes (Cont.)
45
Wiehle Ave. & Reston Station Blvd.- WB left turn lane
Tier 1 Tier 2
AM WB approach:
121 sec.
AM WB approach:
60 sec.

2050 1st Tier Signal Recommendations
46
26 New Signalized Intersection Locations
1 Sunrise Valley Dr. @ Wood Oak Dr. 14 Sunrise Valley Dr. @ Commerce Park Dr. East
2 Sunrise Valley Dr. @ Colts Brook Dr. 15 Soapstone Overpass @ Indian Ridge Rd. Extension
3 Frying Pan Rd. @ Greg Roy Ln. 16 Sunset Hills Rd. @ West of Town Center Pkwy.
4
Monroe St. @ Future Connection to Herndon
Metro
17 Town Center Pkwy. @ North of Sunset Hills
5 Glade Dr. @ Pinecrest Rd. 18 Town Center Pkwy. @ Market St.
6 South Lakes Dr. @ Pinecrest Rd. 19 Sunset Hills Rd. @ Library St.
7 Sunrise Valley Dr. @ Pinecrest Rd. Extended 20 Sunset Hills Rd. @ Soapstone Overpass
8 Sunrise Valley Dr. @ Town Center Pkwy. 21 Sunset Hills Rd. @ East of Soapstone Overpass
9 Town Center Pkwy. @ North of Sunrise Valley Dr. 22 Sunset Hills Rd. @ South Lakes Overpass
10 West of Reston Pkwy. with grid street 23 Reston Station Blvd. @ Metro Center Dr.
11 Sunrise Valley Dr. @ Roland Clarke Place 24 Reston Station Blvd. @ Michael Faraday Dr.
12 Sunrise Valley Dr. @ Indian Ridge Rd. 25 Isaac Newton Square S. @ Isaac Newton Square W.
13 Sunrise Valley Dr. @ Commerce Park Dr. West 26 Wiehle Ave. @ Isaac Newton Square N.

47
New Signals
• New Dominion Pkwy. & Library St.
• Reston Station Blvd. & Soapstone Dr.
• Bracknell Dr. & Stevenage Rd.
• Reston Town Center West consolidated access

48
2050 Unmitigated LOS F

49
2050 1st Tier LOS F

50
2050 2nd Tier LOS F

Reston Network Analysis: Transportation Advisory Commission: July 19, 2016

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Reston Network Analysis: Transportation Advisory Commission: July 19, 2016