Reston Network Analysis: 2030 Results and Roadway Classifications

County of Fairfax, Virginia

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Reston Network Analysis2030 Results & Roadway Classifications

March 13, 2017: Advisory Group MeetingMarch 17, 2017: Stakeholders Meeting

Kristin CalkinsFairfax County Department of Transportation


Agenda• Study Purpose• Project Progress Overview• 2050 Network & Results• Project Prioritization• 2030 Network & Results• Grid of Streets – Roadway Classifications• Next Steps• Questions and Answers2


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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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• Prioritizatio

n of larger projects

Network Analysis Project Process

Advisory Group input, Stakeholder input, Community input

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Level of Service Standard

• LOS E (55 – 80 seconds of average delay for signalized intersections) is the standard for the Reston Transit Station Areas

• LOS F (greater than 80 seconds of average delay) is considered operationally failing

• Greater than 120 seconds of delay is set as a benchmark for problem locations in the Network Analysis

• These locations will likely need significant mitigation measures.

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Mitigation Options• Mitigation Measures - Tiered Approach

– Tier 1: No right of way (ROW) impact – Tier 2: Some right of way impact– Tier 3: Large scale mitigations

• Each grid link is initially assumed to be one lane in each direction (with bike/ped facilities as specified in the Comprehensive Plan)

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2050 Network & Results

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2050 (Full Buildout) Network

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Full Buildout Network

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• All grid links are 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


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 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


Full buildout Signals

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26 New SignalsSunrise Valley Dr. @ Wood Oak Dr. Sunrise Valley Dr. @ Commerce Park Dr. East

Sunrise Valley Dr. @ Colts Brook Dr. Soapstone Overpass @ Indian Ridge Rd. Extension

Frying Pan Rd. @ Greg Roy Ln. Sunset Hills Rd. @ West of Town Center Pkwy.

Monroe St. @ Future Connection to Herndon Metro Town Center Pkwy. @ North of Sunset Hills

Glade Dr. @ Pinecrest Rd. Town Center Pkwy. @ Market St.

South Lakes Dr. @ Pinecrest Rd. Sunset Hills Rd. @ Library St.

Sunrise Valley Dr. @ Pinecrest Rd. Extended Sunset Hills Rd. @ Soapstone Overpass

Sunrise Valley Dr. @ Town Center Pkwy. Sunset Hills Rd. @ East of Soapstone Overpass

Town Center Pkwy. @ North of Sunrise Valley Dr. Sunset Hills Rd. @ South Lakes Overpass

West of Reston Pkwy. with grid street Reston Station Blvd. @ Metro Center Dr.

Sunrise Valley Dr. @ Roland Clarke Place Reston Station Blvd. @ Michael Faraday Dr.

Sunrise Valley Dr. @ Indian Ridge Rd. Isaac Newton Square S. @ Isaac Newton Square W.

Sunrise Valley Dr. @ Commerce Park Dr. West Wiehle Ave. @ Isaac Newton Square N.


Full Buildout Network - Signals

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Full Buildout 3rd Tier Problem Locations(After Tier 3 Mitigation)

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Full Buildout Problem Locations

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Intersections – 120+ Seconds of Delay

Intersections2050

UnmitigatedAfter 2050

1st TierAfter 2050

2nd TierAfter 2050

3rd Tier20 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 location.


Remaining LOS F IntersectionsOf 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

After2050 1st Tier

After2050 2nd Tier

After2050 3rd Tier

Total 24 11 9 5

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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– Innovation TSA

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Project Prioritization

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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• Informed how projects were prioritized


Phasing Analysis Results

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Improvements Description2016 Hours Saved

2050 Hours Saved

1 Grid of Streets Construct an enhanced grid of streets to increase connectivity 1,216 4,817

2 Town Center Town Center Parkway Underpass (4 lanes) from Town Center Parkway and Sunset Hills Road to Sunrise Valley Drive 374 1,322

3 FCP/HOV Widen Fairfax County Parkway: 6 lanes with HOV lane(s) 299 851

4 Soapstone Soapstone Overpass (3 lanes) across the DTR from Sunset Hills Road to Sunrise Valley Drive 300 600

5 Sunset Hills Widen Sunset Hills Road: 6 lanes from Wiehle Ave to Fairfax County Pkwy, and 4 lanes from Wiehle Ave to Hunter Mill Road 257 478

6 Fox Mill Widen Fox Mill Road: 4 lanes from Reston Parkway to Monroe Street 0 714

7 South Lakes South Lakes Overpass (4 lanes ) across the DTR from Sunset Hills Road to Sunrise Valley Drive 240 462

8 FCP/SRV Grade-separated interchange at Fairfax County Parkway and Sunrise Valley Drive 184 514

9 Reston Pkwy Widen Reston Parkway: 6 lanes from South Lakes Drive to the DTR 82 313

10 West Ox Widen West Ox Road: 4 lanes from Lawyers Road to Centreville Road -28 253

11 Monroe Widen Monroe Street: 4 lanes from West Ox Road to Town of Herndon 27 154

12 Pinecrest Extend Pinecrest Road from South Lakes Drive to Sunrise Valley Drive 2 118


Project Prioritization

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Priority 11. Soapstone Overpass2. Town Center Underpass3. Reston Parkway Widening4. Fairfax County Parkway Widening/HOV (from West Ox to the Dulles Toll

Road) Priority 25. Sunrise Valley Drive/Fairfax County Parkway Interchange6. South Lakes Overpass7. Fox Mill Widening Priority 38. West Ox Road Widening9. Monroe Street Widening10.Pinecrest extension


2030 Network & Results

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Mid Buildout Scenario

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• 2030 is a representation of the ‘mid buildout’ of the Reston TSAs

• Assumptions about development levels and improvements were made by the Department of Planning and Zoning (DPZ)

• Helps staff understand where improvements may be needed to support a midpoint in development


Bid Buildout Improvements

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• Roadways:– Soapstone Connector– Town Center Parkway Underpass – Reston Parkway – 6 lanes from EB DTR to South

Lakes Drive• Intersection Modifications:

– Reston Parkway & Sunrise Valley Drive– Reston Parkway & South Lakes Drive– Reston Parkway & Baron Cameron Avenue


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


Mid Buildout Grid

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Tier 3 LOS F Intersections

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• Fairfax County Parkway at Sunrise Valley Drive – 132 seconds of delay in the AM, ok in PM

• Sunset Hills Road at Town Center Parkway– 123 seconds of delay in the AM, ok in PM

• Reston Parkway at South Lakes Drive– 143 seconds of delay in the AM, ok in PM

• Sunrise Valley Drive at Hunter Mill Road– 121 seconds of delay in the AM, ok in PM

• Sunset Hills Road at Hunter Mill Road– 87 seconds of delay in the AM, ok in the PM

• Sunrise Valley Drive at Preston White Drive/South Lakes Drive– 113 seconds of delay in the PM, ok in the AM


Mid Buildout LOS F Intersections

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Mid Buildout LOS F IntersectionsFairfax County Parkway at Sunrise Valley Drive

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2030 2050

Same geometry as existing conditions. Single Point Urban Interchange and 6 lane widening of Fairfax County Parkway

Sunrise Valley Dr.Sunrise Valley Dr.

Fairf

ax C

ount

y Pa

rkwa

y

Fairf

ax C

ount

y Pa

rkwa

y

AM: 132 sec.PM: 64 sec.



Mid Buildout LOS F IntersectionsTown Center Parkway and Sunset Hills Road

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2030 2050

Sunset Hills Road 4 lanes. Sunset Hills Road 6 lanes.

Sunset Hills Road

Tow

n C

ente

r P

arkw

ay



Sunset Hills Road

Tow

n C

ente

r P

arkw

ay


Mid Buildout LOS F IntersectionsReston Parkway at South Lakes Drive

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2030 2050

South Lakes Drive

Rest

on

Park

way



South Lakes Drive

Res

ton

Park

way

No Fox Mill Widening or Pinecrest Road Extension

Includes Fox Mill Widening or Pinecrest Road Extension


Mid Buildout LOS F IntersectionsSunrise Valley Drive at Hunter Mill Road

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2030 2050

Sunrise ValleyDrive

Hun

ter M

ill R

oad



No South Lakes CrossingH

unte

r Mill

Roa

d

Sunrise ValleyDrive

Includes South Lakes Crossing

*The Hunter Mill Road Study has Recommendations influencing this intersection


Mid Buildout LOS F IntersectionsSunset Hills Road at Hunter Mill Road

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2030 2050

Sunset Hills Road

Hun

ter M

ill R

oad



No South Lakes Crossing

Hun

ter M

ill R

oad

Sunset Hills Road


*The Hunter Mill Road Study has Recommendations influencing this intersection


Mid Buildout LOS F IntersectionsSunrise Valley Drive at South Lakes Drive

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2030 2050S

outh

Lak

es

Driv

e



Sunrise Valley Drive

No South Lakes CrossingS

outh

Lak

es

Driv

e

Sunrise ValleyDrive


To South Lakes Crossing


Mid Buildout Scenario Summary

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• Only seven intersection have issues• Improvements in place by 2050 will result in

acceptable operations• County staff will continue to assess

transportation and development in Reston and will modify recommendations as necessary


Urban Street Standards

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Reston TSAs Full Buildout # of Lanes

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Reston TSAs Full Buildout Bike Network

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Wiehle TSA – Roadway Classifications

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Reston Town Center TSA – Roadway Classifications

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Herndon TSA – Roadway Classifications

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Next Steps• Community Meeting April (TBD)• Public Comment• Documentation• Final Report Summer 2017

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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

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3/17


Questions & Comments

For questions and comments about the study please contact:

Kristin Calkins: [email protected](703) 877-5710

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

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Reston Network Analysis: 2030 Results and Roadway Classifications

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