Merrifield Suburban Center - Fairfax County · Merrifield Suburban Center Task Force Meeting #19....

County of Fairfax, Virginia

Department of Transportation

Merrifield Suburban CenterTask Force Meeting #19

John KingFairfax County Department of Transportation

June 18, 2019


Department of Transportation 2

Agenda• Transportation Study Timeline & Status• Baseline Conditions & Land Use Assumptions• ICPH 0.7 FAR & Fairview Park 0.65 FAR

Assessment• ICPH 1.0 FAR & Fairview Park 0.65 FAR

Assessment• Other transportation topics

• Questions/Comments


Transportation Study Timeline


Spring 2018

Fall 2018

Winter 18-19

Spring 2019

Summer 2019

Existing Conditions Study

SSPA Transportation Study

Submitted SSPA Study (12/17/18)

Submitted revised SSPA Study (2/26/19)

Submitted revised SSPA Study (4/19/19)

Review of SSPA Study

Task Force discussion of SSPA StudySSPA: Site Specific Plan Amendment


Review Status• Submittals reviewed by FCDOT & VDOT

– 1st submittal – December 17, 2018– 2nd submittal – February 26, 2019– 3rd submittal – April 19, 2019

• Significant progress since 2nd submittal



SSPA Traffic Study Process• Determine expected change in vehicle trips

resulting from proposed development• Assess impacts of new trips on the roadway

network• Identify potential improvements to mitigate

impacts of background growth and nominations• Recommend changes to the Comprehensive

Plan



Baseline Conditions Overview• Assumes current Comprehensive Plan

land uses and transportation network (year 2045)

• Used to compare impacts of proposed land use changes to the transportation network– 13 of 26 Baseline intersections have overall

intersection LOS E or F in the AM or PM peak hour




Baseline 2045 Assessment


Land Use BaselineICPH

0.7 FARΔ From

BaselineICPH

1.0 FARΔ From

BaselineOffice 767K GSF 518K GSF -249K GSF 722K GSF -45K GSFMedical Office 166K GSF 166K GSF 0K GSF 166K GSF 0K GSFHospital 438K GSF 438K GSF 0K GSF 438K GSF 0K GSFResearch & Development 279K GSF 1.2M GSF 921K GSF 1.4M GSF 1.1M GSFCollege/Education 50K GSF 310K GSF 260K GSF 900K GSF 850K GSFMultifamily Housing -- 705 Units 705 Units 960 Units 960 UnitsHotel -- 125 Rooms 125 Rooms 350 Rooms 350 RoomsRetail -- 64K GSF 64K GSF 68K GSF 68K GSFGrocery Store -- 23K GSF 23K GSF 30K GSF 30K GSFTotal Non-Residential 1.7M GSF ~2.8M GSF 1.1M GSF ~3.9M GSF 2.2M GSFTotal Residential -- 705 Units 705 Units 960 Units 960 Units

ICPH Land Use



Fairview Park Land Use


Land Use BaselineFairview Park

(0.65 FAR)Δ From

BaselineOffice 1.7M GSF 1.1M GSF -600K GSFRetail 35K GSF 180K GSF 145K GSFMultifamily Housing -- 1,000 Units 1,000 UnitsTotal Non-Residential ~1.8M GSF ~1.3M GSF -500K GSFTotal Residential -- 1,000 Units 1,000 Units


ICPH 0.7 FAR & Fairview Park 0.65 FAR Assessment



Mitigation Strategy• Tier 1: No/Minimal right-of-way impact

– Signal timing modification– Modification of striping– Traffic signal addition

• Tier 2: Minor/Moderate right-of-way impact– Turn lanes or extensions– Through lanes– Traffic signal addition

• Tier 3: Large Scale Mitigations



Gallows Road/Arlington Blvd


Proposed Improvements:1) NB signalized dual right turn lanes2) EB signalized dual right turn lanes

Impacted Movements:1) EBR A/A Baseline to E/F2) SBT C/C Baseline to C/E

Overall Intersection LOS:C/E Baseline to D/D

5


Gallows Road/Willow Oaks


Proposed Improvements:1) ICPH Entrance2) NB right turn lane3) NB left turn lanes extended4) SB dual left turn lanes

Impacted Movements:1) NBL D/F Baseline to F/F2) WBR F/F3) SBL F/E

Overall Intersection LOS:B/C Baseline to C/D

6


Gallows Road/Anderson Drive


Proposed Improvements:1) WB dual right turn lanes2) SB left turn lanes extended

Impacted Movements:1) SBT A/C Baseline to A/E

Overall Intersection LOS:C/F Baseline to C/D

7


Gallows Road/Blue Entrance


Proposed Improvements:1) ICPH Entrance2) NB right turn lane3) SB left turn lane

Impacted Movements:1) WBL F/F

Overall Intersection LOS:B/B Baseline to B/C

8


Gallows Road/Gray Entrance


Proposed Improvements:1) NB through lane2) WB dual left turn lanes3) Channelize NB left turn lane

Overall Intersection LOS:B/D Baseline to B/C

9


Gallows Road/Woodburn Road


Proposed Improvements:1) EB triple left turn lanes2) WB through lane

Overall Intersection LOS:D/F Baseline to D/D

Impacted Movements:1) NBL C/E Baseline to F/F2) EBR D/D Baseline to F/E3) WBL F/F Baseline to F/F

10


Gallows Road/I-495 Bridge


Intersection Peak Hour

2045Baseline LOS

2045 With Nominations w/ Mitigation LOS

Gallows Rd/Express Ramp PM F (102s) F (108s)

Gallows Rd/I-495 NB Ramps AM F (94s) F (107s)

• April 2019 Assessment (3rd submission) assumed no improvements to Gallows Road/I-495 bridge

• An additional assessment was initiated that assumed improvements to the Gallows Road/I-495 bridge for the 0.7 FAR ICPH & 0.65 FAR Fairview Park scenario

• FCDOT is reviewing the additional assessment• The improvements would likely address failing intersection

conditions on the bridge


Gallows Rd/Express Ramp*


Proposed Improvements:1) Additional through lane in each

direction on Gallows Rd.

Overall Intersection LOS:C/F Baseline to B/D

Impacted Movements:1) WBL E/F Baseline to F/F

*Results are for ICPH 1.0 FAR, Fairview Park 0.65 FAR scenario


Gallows Rd/I-495 NB Ramps*


Proposed Improvements:1) Triple left turn lanes from I-495 Ramp2) Dual SB left turn lanes on Gallows Rd3) Add NB through and right turn lane on

Gallows Rd

Overall Intersection LOS:F/D Baseline to D/D

*Results are for ICPH 1.0 FAR, Fairview Park 0.65 FAR scenario


Gallows Road Capacity• Southbound PM peak for ICPH 0.7 FAR,

Fairview Park 0.65 FAR scenario is overcapacity:– Route 50 to Anderson Dr. @ 1.05 V/C– Anderson to Woodburn Rd. @ 1.09 V/C– Woodburn Rd. to I-495 NB Ramps @ 0.9 V/C

• Assumed 3 through lanes

• Potential for queue spill back due to closely spaced intersections



Other Potential Mitigation• 4th lane SB on Gallows Road

– Arlington Blvd to Woodburn Rd has a nearly continuous right turn lane

• Wellness Blvd. extension and improvements– Some potential congestion relief for Arlington

Blvd. and Gallows Rd.• Increase ICPH TDM programDepartment of Transportation

25


Fairview Park/Hyson/Lee Highway


Proposed Improvements:1) Signal timing modification2) WB dual left turn lanes

Overall Intersection LOS:E/F Baseline to D/D


Fairview Park/Arlington Blvd. Ramps


Proposed Improvements:1) EB triple left turn lanes

Overall Intersection LOS:E/D Baseline to D/D


Arlington Blvd./Jaguar Trail


Proposed Improvements:1) Signal timing modification2) NB dual left turn lanes

Overall Intersection LOS:F/D Baseline to D/D


ICPH 0.7 FAR & Fairview Park 0.65 FAR Summary

• Overall network is improved from Baseline– 4 of 26 intersections are LOS E or F

• Issues with Gallows Rd. southbound PM volumes– Other mitigation should be identified

• Issues with Gallows Rd./I-495 bridge– Potentially addressed with bridge

improvementsDepartment of Transportation

29


ICPH 0.7 FAR & Fairview Park 0.65 FAR Recommendation

• Intersection improvements– Incorporate Tier 1 & Tier 2 improvements– Incorporate Gallows Rd. bridge improvements

(Tier 3)• Capacity improvements

– Identify and incorporate other needed mitigation



Gallows Road Capacity• Southbound PM peak capacity issue

mitigated (V/C < 1.0)– Assumes Tier 3 improvements are in place

• I-495 Braided Ramp System• I-495 Auxiliary Lane

• Assumes ~20% of Gallows Rd. southbound PM peak traffic shifts to I-495



I-495 Braided Ramp System



I-495 Auxiliary Lane



ICPH 1.0 FAR & Fairview Park 0.65 FAR Summary

• Overall network is improved from Baseline– 2 of 26 intersections are LOS E or F

• Assumes Tier 3 mitigations are in place– I-495 Braided Ramp System– I-495 Auxiliary Lane– Gallows Road/I-495 bridge improvements



Bicycle and Pedestrian Recommendations

• Bicycle and pedestrian systems should serve existing and future development

• Pedestrian improvements such as crosswalks, signals, overpasses and refuge islands should be provided, as needed

• Specific bicycle facilities are recommended in the Countywide Bicycle Master Plan– Includes shared pedestrian and bicycle crossings

over I-495



Transit and Shuttle Service


New FFX ConnectorBus Route

• Fairfax Connector Planned Services (2016 – 2022 Transit Development Plan)– New Bus Route 451– Bus Routes 401 and 402:

limited express service• Private shuttle/local

circulator service


Fairview Park/Yancey/New Providence Operational Analysis

• Multiple mitigations were assessed

• Improvements for Fairview Park Drive could be considered with future development cases/County projects



Other Improvements• Gallows Road/Lee Highway

– Comprehensive Plan recommends additional at-grade and interchange improvements

• Arlington Blvd./Prosperity Ave.– Construct dual left turn lanes for all

approaches• Wellness Blvd. Improvement and

ExtensionDepartment of Transportation

41


ICPH 0.7 FAR & Fairview Park 0.65 FAR Scenario

• Summary– 4 of 26 intersection LOS E or F– Southbound PM peak Gallows Rd from Route 50 to

Woodburn Rd V/C ratio > 1.0– Some impacted movements

• Recommendations– Incorporate Tier 1 & Tier 2 improvements– Incorporate Gallows Rd. bridge improvements (Tier 3)– Identify and incorporate other needed mitigation



ICPH 1.0 FAR & Fairview Park 0.65 FAR Scenario

• Summary– 2 of 26 intersection LOS E or F– Southbound PM peak Gallows Rd from Route 50 to

Woodburn Rd V/C ratio > 1.0– Some impacted movements

• Recommendations– Incorporate Tier 1, Tier 2, and Tier 3 improvements (or

equivalent)



Next Steps

• Task Force discussion of transportation impacts and proposed mitigation

• Continue to work with the applicants regarding the plan amendments and the zoning case



Discussion/Questions


Merrifield Suburban Center - Fairfax County · Merrifield Suburban Center Task Force Meeting #19....

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Transcript of Merrifield Suburban Center - Fairfax County · Merrifield Suburban Center Task Force Meeting #19....