Reston Network Analysis: Tier 3 Mitigation Results: Sept. 26, 2016

County of Fairfax, Virginia

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Reston Network AnalysisTier 3 Mitigation Results

September 26th, 2016Advisory Group Meeting

Kristin CalkinsFairfax County Department of Transportation


Agenda

• Study Purpose• Project Progress Overview• 2050 1st and 2nd Tier Mitigation Results• Tier 3 Alternatives • Tier 3 Results • 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 of 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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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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Level of Service Standard

• LOS E (55 – 80 seconds of average delay) 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

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2050 1st and 2nd Tier Mitigation Results

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2050 Tier 1 and 2 LOS ResultsOf 42 key signalized intersections in the study

area, the number that are forecast to operate at Level of Service F are shown below:

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42 Key Intersections – LOS F

Peak Hour 2050 Unmitigated

After2050 1st Tier

After2050 2nd Tier

AM 24 12 10

PM 26 12 12

In Both AM & PM 22 9 9

In Either AM or PM 27 14 12


2050 Tier 1 and 2 Problem LocationsOf 42 key signalized intersections in the study area, the following intersections have greater

than 120 seconds of delay:

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Intersections – 120+ Seconds of Delay


After 2050 1st Tier

After 2050 2nd Tier

AM 17 12 8

PM 19 7 5

In Both AM & PM 14 5 4

In Either AM or PM 20 10 7


2050 Problem Locations• Unmitigated had 22 Problem Locations• After Tier 1: 13 Problem Locations• After Tier 2: 9 Problem Locations

– 3 were 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

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Network Analysis Follow-On Tasks

Fairfax County Pkwy. & Spring St.

Reston Pkwy. Capacity Improvements

Fairfax County Pkwy. & Sunrise Valley Dr.

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2050 3rd Tier Recommendations

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Tier 3 Alternatives Analysis• 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

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Reston Parkway Options• Option 1: Superstreets • Option 2: Lawyers Road Connection at Fox

Mill Road • Option 3: Flyover from WB Sunset Hills Road to

SB Reston Parkway• Option 4: Continuous flow intersection at Sunset

Hills Road

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Reston Parkway: Lawyers Road Connection

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Rest

on P

arkw

ay

Lawyers Road

Fox Mill Road

Remove Left Turn Bays

New Intersection


Fairfax County Parkway & Spring Street Road /Sunset Hills Road

• Option 1: Fairbrook Drive Ramp & new signal• Option 2: Bi-Directional Ramp• Option 3: Ramp to NB Fairfax County Parkway

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Fairfax County Parkway: Fairbrook Drive Ramp

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Fairfax County Parkway & Sunrise Valley Drive

• Option 1: Tight Diamond Interchange; Fairfax County Parkway overpass over Sunrise Valley Drive

• Option 2: Single Point Urban Interchange (SPUI); Fairfax County Parkway overpass over Sunrise Valley Drive

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Fairfax County Parkway: SPUI

19Fa

irfax

Cou

nty

Par

kway

Fairf

ax C

ount

y P

arkw

ay

Sunrise Valley Drive Sunrise Valley Drive


Other Changes in Tier 3

Modifications to the Tier 3 Model compared to Tier 2• Reston Parkway at Sunrise Valley Drive

– EB dual lefts, thru lane, shared thru/right• Reston Parkway at WB Baron Cameron Avenue

– WB dual lefts • Sunset Hills Road at Soapstone Drive Connector

– NB left turn lane & right turn lane– WB left turn lane

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Other Changes in Tier 3 (Cont.)• Left turn lanes:

– SB Soapstone Drive at Sunrise Valley Drive– SB Pinecrest Road extension at Sunrise Valley Drive– NB & WB Sunset Hills Road at grid link east of

Soapstone– EB & WB Sunset Hills Road at Michael Faraday – EB Sunset Hills Road at Library Street extended

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2050 3rd Tier Mitigation Results

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2050 Unmitigated Problem Locations

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2050 1st Tier Problem Locations

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2050 2nd Tier Problem Locations

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2050 3rd Tier Problem Locations

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2050 Problem Locations

Intersections – 120+ Seconds of Delay


After 2050 1st Tier

After 2050 2nd Tier

After 2050 3rd Tier

AM 17 12 8 2

PM 19 7 5 1

In Both AM & PM 14 5 4 0

In Either AM or PM 20 10 7 2

Of the 42 key signalized intersections, only 2 continue to have 120 seconds of delay or

greater after Tier 3 Mitigation.

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• Reston Parkway at South Lakes Drive: PM 138 Seconds• Centreville Road & Sunrise Valley Drive: PM 138 Seconds* In Innovation TSA.


Tier 3 Problem LocationsReston Parkway at South Lakes Drive

• 138 seconds of average delay in the AM Peak

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Tier 3 LOS ResultsOf the 42 key signalized intersections, only 4 continue to

have 80 seconds of delay or greater after Tier 3 Mitigation. Of these, 3 are on Centreville Road

42 Key Intersections – LOS F


After2050 1st Tier

After2050 2nd Tier

After2050 3rd Tier

AM 24 12 10 4

PM 26 12 12 7

In Both AM & PM 22 9 9 3

In Either AM or PM 27 14 12 8

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*4 Interactions that operate at LOS F after 3rd Tier are in the Innovation Area


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 – 123 seconds in AM & 88 seconds of delay in the PM

• Reston Parkway at Sunset Hills Road – 83 seconds of delay in the PM

• 4 intersections in Innovation TSA

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Tier 3 LOS F Intersections (Cont.)Fairfax County Parkway at Baron Cameron Avenue

• 100 seconds of average delay in the PM Peak

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Reston Parkway at Sunrise Valley Drive • 92 seconds of average delay in the PM Peak

Tier 3 LOS F Intersections (Cont.)

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Tier 3 LOS F Intersections (Cont.)Reston Parkway at Sunset Hills Road

• 83 seconds of average delay in the PM Peak

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Next Steps• 2050 Phasing Analysis • 2050 VISSIM for Dulles Toll Road• 2030 VISUM Analysis of network• Roadway classification of grid links using DRPT

Urban Street Guidelines

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ScheduleTask 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

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9/26/16

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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: Tier 3 Mitigation Results: Sept. 26, 2016

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