reston network analysis: 2050 2nd tier mitigation results

County of Fairfax, Virginia

Reston Network Analysis2050 2nd Tier Mitigation Results

March 28 & 30, 2016Advisory Group & Stakeholders Group

Kristin CalkinsFairfax County Department of Transportation


Agenda

• Study Purpose• Project Progress Overview• 2050 2nd Tier Mitigation Results• Next Steps• Questions and Answers

2


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

3

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

6


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)

7


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 were initially assumed 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 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 1nd Tier Recommendations

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2050 1st Tier Signal Recommendations

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26 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.


Problem Locations After Tier 1 Mitigation

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• Unmitigated had 22 Problem Locations• 13 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



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Mitigation Measures2nd Tier: Some Right of Way Impact

• Additional signals where needed• Turn lanes

– New Left and Right turn lanes• Additional through lane• Additional grid link



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


2050 2nd Tier Intersection Control

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Existing Signal

Signal Proposed by different study

Signal Proposed


2050 2nd Tier Intersection Control (Cont.)

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Existing Signal

Signal Proposed by different study

Signal Proposed

Signal Proposed in Tier 2



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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.There are still locations with turning movements with delays in excess 120 seconds that will be looked at for possible turn-lanes


2050 2nd Tier RecommendationsNew Turn Lanes (Cont.)

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Monroe St & Frying Pan Rd/Fox Mill Rd – new WB right turn lane Tier 1 Tier 2

Mon

roe

St.

Frying Pan Rd.

Mon

roe

St.

Frying Pan Rd.

AM WB Right: LOS F (145 sec.)

AM WB Right: LOS E (55 sec.)



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Reston Pkwy. & Sunrise Valley Dr. – modified WB approachTier 1 Tier 2

Rest

on P

kwy.

Sunrise Valley Dr.

Rest

on P

kwy.

Sunrise Valley Dr.

AM: 142 sec. AM: 117 sec.



22

Town Center Pkwy. & Sunset Hills Rd. - SB & NB left turn lanesTier 1 Tier 2

Tow

n C

ente

r P

kwy.

Sunset Hills Rd. Sunset Hills Rd.

Tow

n C

ente

r P

kwy.

AM: 106 sec.PM: 157 sec.

AM: 41 sec.PM: 40 sec.



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Wiehle Ave. & Reston Station Blvd.- WB left turn laneTier 1 Tier 2

Wie

hle

Ave.

Reston Station Blvd.

Wie

hle

Ave.

Reston Station Blvd.

AM WB approach: 121 sec.

AM WB approach: 60 sec.



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Wiehle Ave. & N. Isaac Newton Sq.- EB left turn lane & WB right turn lane

Tier 1 Tier 2

Wie

hle

Ave

.

N. Isaac Newton Sq.

Wie

hle

Ave

.

N. Isaac Newton Sq.

PM: 103 sec. PM: 65 sec.


2050 2nd Tier RecommendationsTown of Herndon

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Comprehensive Plan Improvements• Fairbrook Drive Extension• Worldgate Drive Extension

Comp. Plan Turn Lanes• Spring St. & Ramp to Fairfax County Pkwy. • Spring St. & Herndon Pkwy. • Monroe St. & Worldgate Dr. • Monroe St. & Herndon Pkwy. Comp. Plan New Signals • Worldgate Dr. Extension & Herndon Pkwy. • Herndon Pkwy. & Fairbrook Dr.


2050 2nd Tier RecommendationsTown of Herndon Comprehensive Plan Improvements

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2050 2nd Tier RecommendationsTown of Herndon Comprehensive Plan Improvements (cont.)

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Spring St. & Herndon Pkwy.

Spring St. & Ramp to Fairfax County Pkwy.


2050 2nd Tier RecommendationsTown of Herndon Comprehensive Plan Improvements (cont.)

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Worldgate Dr. & Herndon Pkwy.

Monroe St. & Worldgate Dr.

Monroe St. & Herndon Pkwy.


2050 2nd Tier MitigationResults

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2050 2nd 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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Level of Service Standard• 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• Documentation of the agreement on LOS is

underway

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2nd Tier LOS Results• 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

UnmitigatedAfter

2050 1st TierAfter

2050 2nd TierAM Peak Hour 24 12 10

PM Peak Hour 26 12 12

AM & PM Peak Hour 22 9 9


2050 1st Tier Peak Hour LOS (Page 1)

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2050 2nd Tier Peak Hour LOS (Page 1)

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35



36



37



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2050 Problem Locations

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Intersections – 120+ Seconds of Delay

Peak Hour 2050 Unmitigated

After 2050 1st Tier

After 2050 2nd Tier

AM 17 12 8

PM 19 7 5

AM & PM 14 5 4

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 1st Tier Problem Locations

40

InnovationGrid is Finalized

Innovation & Herndon TSAs


2050 2nd Tier Problem Locations

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2050 1st Tier Problem Locations (cont.)

42

Reston & Wiehle TSAs


2050 2nd Tier Problem Locations (cont.)

43

Reston & Wiehle TSAs



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

– 3 are in Innovation TSA which has already been finalized

– 6 are 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

Ave.



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• Intersections with Delay over 120 Seconds1. Centreville Road & Frying Pan Road 2. Centreville Road & McNair Farms Drive3. Centreville Road & Sunrise Valley Drive 4. Fairfax County Parkway & Spring Street 5. Fairfax County Parkway & Sunrise Valley Drive6. Reston Parkway & Baron Cameron Avenue7. Reston Parkway & Bowman Towne Drive8. Reston Parkway & Sunrise Valley Drive 9. Reston Parkway & South Lakes Drive Fo

llow

on

Task

In

ters

ectio

nsIn

nova

tion

Inte

rsec

tions


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Network Analysis Follow-On Tasks

Fairfax County Pkwy. & Spring St.

Reston Pkwy. Capacity Improvements

Fairfax County Pkwy. & Sunrise Valley Dr.


3rd Tier Mitigation

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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

48


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• Review Tier 2 mitigations with interested parties• Advisory Group on Funding – Monday, April 11• Public Meeting – late April/early May• Present Tier 3 mitigation measures• Phasing Analysis

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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

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

3/28/16


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 2nd tier mitigation results

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