Huntington Area Transportation Study (HATS) Project Update Board Transportation Committee Jan. 20, 2015

1. County of Fairfax, VirginiaCounty of Fairfax, Virginia
Department of Transportation
Huntington Area Transportation Study (HATS)
Project Update
Presented to:
Fairfax County Board
Transportation Committee
January 20, 2015

2. County of Fairfax, Virginia
Department of Transportation
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Study Purpose
• Address transportation deficiencies identified during prior
comprehensive planning efforts (Huntington Club, North Gateway
APRs)
• Confirm and verify existing and future (projected) transportation
issues and concerns within the HATS study area
• Develop transportation improvement strategies and mitigation
measures with stakeholder and BOS input
• Evaluate the effectiveness of potential transportation solutions
• Assess potential at-grade solutions, in addition to grade-separated,
at Route 1/Huntington Avenue/Fort Hunt Road
• Evaluate proposed higher land use intensity at North Gateway
• Determine recommendations and conclusions

3. County of Fairfax, Virginia
Department of Transportation
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4. County of Fairfax, Virginia
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5. County of Fairfax, Virginia
Key Issues
• Several large-scale, high-intensity Transit Oriented Development
(TOD) sites recently approved that may negatively impact the
feasibility of further TOD within the Huntington Transit Station Area
(TSA)
• Desire for an at-grade solution for the intersections of Route 1 and
Huntington Avenue and Fort Hunt Road, rather than the grade-
separated interchange currently in the Comprehensive Plan
• Proposal for higher land use intensity at the North Gateway site with a
need for expedited results to respond to evolving market conditions
and support on-going revitalization efforts
• Traffic issues within the Penn Daw CBC – Note that a separate effort
to identify improvements along North Kings Highway is nearly
complete and results will be incorporated
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6. County of Fairfax, Virginia
Department of Transportation
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Study Overview
• Multimodal Existing Conditions Analysis & Assessment
• Multimodal Model Development & Future Conditions Analysis &
Assessment
• Detailed Analysis of Route 1/Huntington Ave/Fort Hunt Rd Intersections
o Evaluation of At-Grade & Grade-Separated Concepts
• Identification of Congestion Reduction Strategies and Mitigation
Measures
• Evaluation of Alternative Land Use for North Gateway Site
• Conclusions & Recommendations
*** Stakeholder input will be obtained throughout study ***

7. County of Fairfax, Virginia
Department of Transportation
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Measures of Effectiveness (MOEs)
• Evaluation criteria to gauge existing and future performance
o Average delay per vehicle by intersection and for individual
approach movements
o Queue length and storage for critical individual approach
movements
o Level of Service by intersection and for individual approach
movements
o Average delay per vehicle within the network
o Average speed within the network
o Average travel time within the network
o System-wide delay
*** AM and PM peak hours ***

8. County of Fairfax, Virginia
North Gateway Site
• The North Gateway Site was recently approved by the board for a 1.65
Floor Area Ratio (FAR), with further desire for a 2.0 FAR
• Located adjacent to the intersections of Route 1 and Huntington
Avenue and Fort Hunt Road, it is unlikely that site can develop to its full
potential if a grade-separated interchange is constructed
• Several BRAC and South County Area Plan Review (APR) nominations
have been approved by the County in the Huntington core area
• Certain APRs were analyzed and approved contingent on a planned
interchange at the Route 1 intersections with Huntington Avenue and
Fort Hunt Road
• Citizens and community have concerns about development of an
interchange
• Study will analyze at-grade and grade-separated concepts
• Study will meet VDOT traffic impact analysis requirements
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9. County of Fairfax, Virginia
Draft At-Grade & Grade-Separated Concepts
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• At-grade and grade-separated concepts to be evaluated for the
intersections of Route 1 at Huntington Avenue and Fort Hunt Road
• Multiple concepts under development
• None of these concepts have been tested
• Staff is not making a recommendation at this time
• Two at-grade and two grade-separated concepts will be selected for
more detailed analysis
• Looking for initial feedback on elements associated with current set of
draft concepts

10. Replace left turn
lanes with median
and exclusive right
(for Huntington Ave
rights/lefts/U-turns)
No Right
Turns (1 left,
2 thru)
Install signs:
NB Route 1 = straight.
SB Route 1 = left.
All U/left
turns from SB
Route 1
Remove left turn
concrete barrier.
Shift lanes if
possible/necessary
to add dual right
turn lanes.
No left/right turns Closed roadway
Existing traffic signal
Install Yield
Signs for I-495
Off Ramp
At-Grade Option A: Route 1 Left Turn Movements Prohibited
Optional
right-in/right-
out access to
Route 1
xxx
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11. At-Grade Option B: “Superstreet” with Side Street Left Turn & Through Movements Prohibited
Optional
New Median
Break &
Signal
3 thru,
1 shared
thru/right
Or New
Signal at
Existing
Break
Right turn on red prohibitions are recommended during peak hours to
reduce the speed differentials on Route 1, unless add lanes can be used.
New traffic signal Closed roadway
Existing traffic signal
Provide access
to North
Gateway
development
here
Provide left out
signalized
movement
here
I-495 Ramps
Install signs:
NB Route 1 = straight.
SB Route 1 = left.
xxx 11

12. At-Grade Option B: “Superstreet” with Side Street Left Turn & Through Movements Prohibited
Right turn on red prohibitions are recommended during peak hours to
reduce the speed differentials on Route 1, unless add lanes can be used.
New traffic signal Closed roadway
Existing traffic signal
Optional new median
break & signal or new
signal at an existing
median break
Provide left out
signalized
movement here
xxx 12

13. At-Grade Option B: “Superstreet” with Side Street Left Turn & Through Movements Prohibited
Right turn on red prohibitions are recommended during peak hours to
reduce the speed differentials on Route 1, unless add lanes can be used.
New traffic signal Closed roadway
Existing traffic signal
3 thru, 1 shared
thru/right
Provide access to
North Gateway
development here
Provide left out
signalized
movement here
xxx 13

14. At-Grade Hybrid (A-B) Option: Route 1 to Fort Hunt Left Turns Shifted to Huntington
Install signs:
NB Route 1 = straight.
SB Route 1 = left.
Existing traffic signal Closed roadway
Widen
roadway/decrease
median width to
provide dual left;
may extend storage
to Fort Hunt
Provide access
to North
Gateway
development
1 left, 1 thru,
1 shared thru/right,
1 receiving lane
Right-In/
Right-Out
For this Hybrid Option, Route 1/Fort Hunt Rd operates better. The other two intersections operate slightly
worse. Overall, there is a small 3-5% increase in the CLV & v/c ratios when compared to the No Build.
Provide access
to North
Gateway
development
Realign Old
Richmond Hwy to
provide block-like
jughandle access
I-495 Ramps
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15. County of Fairfax, Virginia
Displaced Left Turn (DLT) Intersections
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16. County of Fairfax, Virginia
Displaced Left Turn (DLT) Intersections
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17. At-Grade Option C: Partial Displaced Left Turn Intersection
1 shared thru/right,
2 exclusive right
turn lanes
1 left, 2 thru,
1 right,
1 receiving lane
New traffic signal Existing traffic signal
Optional access
to North Gateway
Install signs:
NB Route 1 = straight.
SB Route 1 = left.
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18. At-Grade Option C: Partial Displaced Left Turn Intersection
New traffic signal Existing traffic signal 18

19. At-Grade Option C: Partial Displaced Left Turn Intersection
New traffic signal Existing traffic signal No left turn Optional no left turn 19

20. Grade-Separated Option D: Woodrow Wilson Bridge Project – Alternate 1
Route 1
(Richmond Highway)
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21. Grade-Separated Option E: Huntington Avenue Interchange
Route 1 lowered. Bridge over Huntington Rd raised.
NB Fort Hunt to SB Route 1 prohibited. (24 veh in AM, 30 veh in PM)
Left turns to
Fort Hunt,
exit right
All left turns to
Fort Hunt Road
Provide a thru
lane & dual right
lanes.
Provide two
receiving
lanes.
Provide two
thru lanes & an
exclusive right
turn lane
Two phase
signal
Left turns to
Huntington,
exit left
Configure
westbound
to allow
left/thru/right
movements
Route 1
(Richmond Highway)
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22. Grade-Separated Option F: Single Point Urban Interchange (SPUI)
Provide access to
North Gateway:
right-in/right-out
onto ramp
New traffic signal Existing traffic signal Closed roadway
Connect
Huntington Rd
to Cameron Run
Terrace
Route 1 lowered. SPUI raised. Through
movements on Route 1 are uncontrolled.xxx 22

23. County of Fairfax, Virginia
Project Schedule – 2014/2015
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Jun-Sep
2014
• Existing Conditions Assessment (Complete)
• Travel Demand Model Development (Complete)
Oct-Feb
2014/15
• Model Assessment (Complete)
• Detailed Route 1/Huntington/Fort Hunt Analysis
Feb-May
2015
• Identification & Evaluation of Mitigation Measures
• Identification of Interchange Solution
• North Gateway Land Use Assessment
• Recommendations & Conclusions

24. County of Fairfax, Virginia
Questions / Comments
Arpita Chatterjee & Thomas Burke
Fairfax County Department of Transportation
4050 Legato Road, Suite 400
Fairfax, VA 22033
(703) 877-5600
Thomas.Burke@FairfaxCounty.gov
Arpita.Chatterjee@FairfaxCounty.gov
Department of Transportation
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