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Tysons
January 15, 2013January 15, 2013
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Operational Analysis of Dulles Toll Road Ramps to Tysons
Boone Boulevard Ramp Analysis
Seyed NabaviFairfax County Department of Transportation
Tysons
Study Background
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• Tysons Comprehensive Plan Amendment Approved in June 2010
• Study Kickoff in May 2011• Board Transportation Committee May 8, 2012• Tysons Partnership Briefing May 23, 2012• Public Information Meeting May 30, 2012
Tysons
Purpose of Study
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• Evaluate the feasibility of the three general ramp locations included in the comprehensive plan amendment• West of Route 7• Between Route 7 and Spring Hill Road• East of Spring Hill Road
Tysons
Study Background
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Tysons
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Boone BoulevardRamp Options
Tysons
• Developed several options for ramp to Boone Boulevard– The Western Ramp alignment (Previously Option 3)– One-lane ramp in each direction going through the back of
Sheraton Hotel site. – A two-lane reversible ramp going through the back of Sheraton
Hotel site (not precluding the one lane in each direction)– Four-lane ramp going through the back building of the Sheraton
Hotel. (Ultimate condition when the site is totally redeveloped)
• Comparison of the Boone Boulevard alignments
Purpose of Analysis
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Tysons
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Option A
Western Ramp Alignment (Previously Option 3)
Tysons
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Option B
One Lane in each direction through Sheraton site
Tysons
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Option C
Two Lane Reversible Lane through Sheraton site
Tysons
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Option D
Four Lane Ramp through Sheraton site
Tysons
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Traffic Analysis
Tysons
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Traffic Volumes
• Option A attracts more traffic from Route 7• Option A provides shorter travel time to reach the
center of Tysons West from Dulles Toll Road• Options C and D provide comparable improvements to
Route 7 in the peak direction• Options A, B & D provide counter flow benefits
Route 7 Traffic Volumes For Options(vehicles per hour)
Alternative No Build Option A Option B Option C Option D
DescriptionNo Ramp Western Ramp
Alignment
Alignment through back of Sheraton
(one lane / direction)
Alignment through back of Sheraton (reversible lanes)
Alignment through back of Sheraton
(two lanes / direction)
Volume Volume % Change Volume % Change Volume % Change Volume % Change
AM PeakEastbound 1441 637 -56% 1162 -19% 1043 -28% 1021 -29%
Westbound 388 141 -64% 139 -64% 392 0% 88 -77%
PM PeakEastbound 714 342 -52% 496 -31% 714 0% 464 -35%
Westbound 910 523 -43% 648 -29% 559 -39% 523 -43%
Tysons
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Comparison MatrixAlternative Option A Option B Option C Option D
Description Western Ramp AlignmentAlignment through back of
Sheraton (one lane / direction)
Alignment through back of Sheraton (reversible lanes)
Alignment through back of Sheraton
(two lanes / direction)
Traffic Diverted to New Ramp High Medium High High
Improvement to Route 7 Intersection Operations (AM / PM) Low / Medium High / High Low / Medium Low / High
Improvement to Grid of Streets Intersection Operations (AM / PM) Low / High Medium / Medium Low / Medium Low / Low
Existing Impervious Area / Proposed Impervious Area, SF 70,000 / 280,000 40,000 / 150,000 30,000 / 130,000 50,000 / 190,000
ROW & Permanent Easement Areas, SF 290,000 60,000 60,000 80,000
Environmental Very High Impact Medium Impact Medium Impact Medium Impact
Constructability Medium Difficulty High Difficulty High Difficulty High Difficulty
Cost * $44,000,000 $22,000,000 $26,000,000 $39,000,000
* Cost includes ramp improvements east of the DTR. ROW, utilities, drainage, environmental mitigation and/or
reconstruction of impacted MWAA facilities are not included.
Tysons
• Option A provides traffic improvements to Route 7, however improvements are comparable to the other three options
• Option A adds significant impervious area for drainage of the project site
• Option A has significant environmental impacts compared to the other three options
• Options A is significantly more expensive than other three options
• Options B,C & D require less right of way and property owner is willing to consider
• Options B,C & D are challenging from a constructability stand point, but offer significant traffic benefits at a lower cost
Conclusions
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Tysons
• Western Ramp Alignment (Option A) will be eliminated from further study
• Options B,C and D will be coordinated with JBG, the developer of Sheraton site and the adjacent neighborhoods
• Options B,C and D will be investigated and analyzed further in combination with the other ramp connections in Tysons
Conclusions
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Tysons
Next Steps / Schedule
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• Modeling currently underway– Expand Subarea Model January 2013
• Dulles Toll Road Mainline • Ramp Merge/Diverges• Arterials/Grid
– VISUM Simulation Analysis of 3 Alternatives January 2013– Revise Alternatives Post Public Meeting No. 1
February 2013 – Submit Revised Alternatives to VDOT/MWAA for Review
March 2013– Select Preferred Ramp Alternative March 2013– Additional Stakeholder Meetings March/April 2013– Public Meeting No. 2 April 2013– Incorporate Input April/May 2013– Provide Recommendation to Board May/June 2013
Tysons
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Questions / Discussion