reston network analysis: 2050 1st tier mitigation results

County of Fairfax, Virginia

Reston Network Analysis2050 1st Tier Mitigation Results

February 19, 2016Stakeholders Group

Kristin CalkinsFairfax County Department of Transportation


Agenda

• Study Purpose• Project Progress Overview• 2050 1st Tier Mitigation Results• Mitigation Options• Next Steps• Questions and Answers

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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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Reston Network Analysis Tasks1. Data Collection – done2. Existing Conditions – done3. Future Conditions – 2050 mitigation underway

– Determine Grid of Streets

4. Phasing Analysis 5. DRPT Classifications6. Specific Location Improvements For Additional Study

– Reston Parkway– Sunrise Valley Drive @ Fairfax County Parkway– Spring Street @ Fairfax County Parkway– Rock Hill Bridge

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Data Collectio

n• Traffic

Counts in

June 2015

• Travel Time Runs

Existing Conditi

ons• Cap

acity Analysis

• Level of

Service

Test Grid of

Streets (2030 &

2050)• Traffic

Forecasting Capac

ity Analy

sis • Level

of Servic

e

Mitigation

• Signal re-

timing• New

links• Turn

lanes• Additi

onal lanes

Roadway Classifica

tion• DRPT

Design

Guidelines• B

ike lanes

• Sidewalks/ Pedestrian routes

• On-Street Parking

• Transit Routes

Finalize Grid of Streets (2030 & 2050)

Based on:• Advis

ory Group input

• Stakeholde

r input

• Communit

y input

Phasing Analysis• Priori

tization of

larger projec

ts

Network Analysis Project Process

Advisory Group input, Stakeholder input, Community input


Reston VISUM Model

Tysons

Reston

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Mitigation

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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)

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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 and Stakeholders

• Each grid link is initially assumed to be one lane in each direction

– No turn lanes at new intersections

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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

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Mitigation Measures1st Tier: No Right of Way Impact

•Intersection Reconfiguration– Optimized signal timing and phasing– Lane configuration modification

Westwood Center Dr. @ Route 7 (2013) Westwood Center Dr. @ Route 7 (2015)

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Mitigation Measures (Cont.)1st Tier: No Right of Way Impact

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•Existing and Potential Future Signals– Adding/removing traffic signals– Adding/modifying stop control– Modifying Parking

Westwood Center Dr. @ Sheraton Tysons Dr. (2015)

Westwood Center Dr. @ Sheraton Tysons Dr. (2013)


2050 1st Tier Recommendations

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2050 1st Tier Intersection Control

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Existing Signal

Signal Proposed by different study

Signal Proposed


2050 1st Tier Intersection Control (Cont.)

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Existing Signal

Signal Proposed by different study

Signal Proposed


2050 1st Tier Signal Recommendations

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New Signalized Intersection LocationsSunrise 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.


Lane Re-allocationSunrise Valley Drive @ Preston White Drive / S Lake Drive

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2050 Unmitigated 2050 1st Tier Mitigation


2050 1st Tier MitigationResults

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2050 1st Tier Mitigation Results• Stop Controlled Intersections:

– Overall LOS– Overall delay

• Signalized Intersections:– Overall LOS– Overall delay– LOS by movement– Delay by movement– Volumes for each movement

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1st Tier LOS Results• LOS E is the standard for the Reston Transit

Station Areas• Of 42 key signalized intersections in the study area,

the following are forecast operate at Level of Service F:

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42 Key Intersections – LOS F 2050 Unmitigated 2050 1st Tier

AM Peak Hour 24 11

PM Peak Hour 26 11

AM & PM Peak Hour 22 9


2050 Unmitigated Peak Hour LOS (Page 1)

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2050 1st Tier Peak Hour LOS (Page 1)

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2050 Problem Locations

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Intersections – 120+ Seconds of Delay

Peak Hour 2050 Unmitigated

2050 1st Tier Mitigation

AM 17 12

PM 19 7

AM & PM 14 5

With signal re-timings and the introduction of signals there has been a reduction in the number of intersections experiencing delays

in excess of 120 seconds


2050 Unmitigated Problem Locations

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2050 1st Tier Problem Locations

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2050 Unmitigated Problem Locations (cont.)

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2050 1st Tier Problem Locations (cont.)

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2050 Unmitigated Problem Locations (cont.)

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2050 Mitigated Problem Locations (cont.)

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2050 1st Tier Problem Locations

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• 2050 Unmitigated had 22 Problem Locations• Intersections with Delay over 120 Seconds

1. Frying Pan Road & Sunrise Valley Drive2. Frying Pan Road & Centreville Road 3. Centreville Road & Coppermine Road 4. Centreville Road & Sunrise Valley Drive 5. Monroe Street & Fox Mill Road 6. Spring Street & Herndon Parkway 7. Fairfax County Parkway & Baron Cameron Avenue 8. Fairfax County Parkway & Sunrise Valley Drive9. Town Center Parkway & Sunset Hills Road10. Reston Parkway & Baron Cameron Avenue11. Reston Parkway & Bowman Towne Drive12. Reston Parkway & Sunrise Valley Drive 13. Reston Parkway & South Lakes Drive


2050 1st Tier Available Data

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2050 AM Peak Hour - Unmitigated

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2050 AM Peak Hour – 1st Tier

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2050 AM Peak Hour: Unmitigated vs. 1st Tier

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2050 PM Peak Hour - Unmitigated

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2050 PM Peak Hour – 1st Tier

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2050 PM Peak Hour: Unmitigated vs. 1st Tier


AM Peak Hour Site Trips and Link Volumes

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PM Peak Hour Site Trips and Link Volumes

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Future Mitigation

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Mitigation Measures2nd Tier: Some Right of Way Impact

• Turn lanes– New Left and Right turn lanes– Extended turn lanes: adds storage

• Additional through lane• Additional grid link


Mitigation Measures3rd 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

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Mitigation Measures3rd 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

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Next Steps• Apply ROW impact Mitigation Measures

– Turn lanes– Turn lane extensions– Additional thru lane

• Develop possible mitigation measures for problem locations that remain to discuss with Advisory Group

• Meet with Advisory Group on possible 2nd Tier mitigation measures

• Meet with Stakeholder group on 2nd Tier

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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)

3A1 Analyze Future Conditions (2030)

3B Simulation of the Dulles Toll Road

3C Microsimulation - Optional

4A Meetings/Presentations

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

Feb-15May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Sep-16 Oct-16Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16

2/19/16


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: 2050 1st tier mitigation results

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