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Hunter Mill Road and Sunset Hills Road Study
Community Meeting #4Progress Update
June 29, 2016
Kristin CalkinsFairfax County Department of Transportation
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Presentation Agenda• Project Objectives• Summary of Community Comments• Review of Developed Alternatives• Traffic Analysis Results • Next Steps• Colvin Run Bridge• Questions and Answers
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Project Objectives• Address existing congestion• Plan for future traffic• Address queuing along Hunter Mill Road and
Sunset Hills Road• Improve access to the Dulles Toll Road by
minimizing congestion• Maintain Hunter Mill Road’s character by
applying context sensitive solutions
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Project Study AreaIntersection ID Intersection
CurrentIntersection Control Type
1Hunter Mill Road at Sunrise Valley Drive
Signalized
2Hunter Mill Road at
DTR EB RampsSignalized
3Hunter Mill Road at
DTR WB RampsSignalized
4Hunter Mill Road at
Sunset Hills RoadSignalized
5Hunter Mill Road at
Crowell RoadUnsignalized
(All-Way Stop)
6Hunter Mill Road at Hunting Crest Lane
Unsignalized(Two-Way Stop)
7Hunter Mill Road at
Lake Fairfax ParkUnsignalized
(Two-Way Stop)
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6
5
4 32
1
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Project Background• Board of Supervisors authorized study as a follow-on
study to the Reston Phase I Plan Amendment• Three meetings held thus far:
• December 8, 2014: Kick-Off • February 24, 2015: Existing & No-Build conditions and
community input on alternatives• May 20, 2015: Analysis Findings
• July 2015: Project put on hold at request of community to allow for new capacity analysis methodologies for roundabouts to be adopted by the Transportation Research Board
Project ProcessKi
ck O
ff M
eetin
gEx
isting
Co
nditi
ons
Futu
re
Cond
ition
s
Com
mun
ity
Mee
ting #
2
Deve
lopm
ent o
f Al
tern
ative
s
Com
mun
ity
Mee
ting #
3
Proj
ect p
ut
on H
old
Com
mun
ity
Mee
ting
#4
Anal
ysis
of
Alte
rnati
ves
Com
mun
ity
Mee
ting #
5
Sele
ction
of
Pref
erre
d Al
tern
ative
Final
Repo
rt
Com
mun
ity
Mee
ting #
6
Inco
rpor
ation
into
Com
p Pl
an
24 MONTHS
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We are Here
Summary of Community Comments• Concern that traffic from Wiehle Avenue may be
diverted to Hunter Mill Road• Concern that the signal at Crowell Road may
increase delays in the off-peak• Maintain the character of Hunter Mill Road• Main goal of study is to improve Level of Service
(LOS) on Hunter Mill Road
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Summary of Community Comments (Cont.)• Roundabouts preferred at Dulles Toll Road ramps• Widen Hunter Mill Road from eastbound Dulles
Toll Road to Sunrise Valley Drive• Concern that improvements may attract more
development• Community wants an in-depth review of
roundabouts• There should be a mix and match of alternatives
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Alternatives Developed Crowell Road
Sunset Hills Road
Sunrise Valley Drive
Hunt
er M
ill R
oad
WB DTR
EB DTR
No-BuildCrowell Road
Sunset Hills Road
Sunrise Valley Drive
Hunt
er M
ill R
oad
WB DTR
EB DTR
Alt. 1ACrowell Road
Sunset Hills Road
Sunrise Valley Drive
Hunt
er M
ill R
oad
WB DTR
EB DTR
Alt. 1B
Roundabout
Signal Proffered
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Alternatives Developed (Cont.)Crowell Road
Sunset Hills Road
Sunrise Valley Drive
Hunt
er M
ill R
oad
WB DTR
EB DTR
No-BuildCrowell Road
Sunset Hills Road
Sunrise Valley Drive
Hunt
er M
ill R
oad
WB DTR
EB DTR
Alt. 2Crowell Road
Sunset Hills Road
Sunrise Valley Drive
Hunt
er M
ill R
oad
WB DTR
EB DTR
Alt. 3
Signal Proffered
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May 2015: 2030 ComparisonIntersection
Roundabouts SignalsNo Build Alt. 1A Alt. 1B Alt. 2 Alt. 3
OVERALL LOS AM (PM)Hunter Mill Rd. @Sunrise Valley Dr. D (D) B (E) B (E) D (D) D (D)
Hunter Mill Rd. @DRT EB Ramps C (C) B (A) B (A) B (B) B (B)
Hunter Mill Rd. @DTR WB Ramps C (E) - B (E) B (D) B (C)
Hunter Mill Rd. @DTR WB Ramps & Sunset Hills Rd. - F (F) - - -
Hunter Mill Rd. @Sunset Hills Rd.* D (D) - - D (C) -
Hunter Mill Rd. @Crowell Rd.** C (C) C (A) - C (C) -
Hunter Mill Rd. @Crowell Rd. / Sunset Hills Rd. - - E (B) - D (C)
LOS Standard = LOS D* Alt 2 in new location ** No Build includes the proffered signal at Crowell Road
New Roundabout Methodology• New research resulted in:
• Re-assessment of Roundabout Capacity Models for the Highway Capacity Manual
• New methodology (adopted January 2016) resulted in an approximate 10-12% increase in roundabout capacity
• New model prioritizes movements with higher volumes• Resulting in improved LOS for heavier movements and overall
LOS
• This study is an operational assessment, not an engineering design. Roundabouts generally have greater ROW impacts
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Sunrise Valley Drive Intersection
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Year 2030 HCM 2010 2015 ModelSouthbound A (A) A (A)
Eastbound B (F - 177 sec) B (F - 135 sec)
Westbound B (A) E (B)
Overall B (E) C (D)Results for AM(PM)
This study is an operational assessment, not an engineering design. Roundabouts generally have greater ROW impacts
Dulles Toll Road Eastbound Ramps
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Year 2030 HCM 2010 2015 ModelNorthbound B (B) C (B)
Southbound A (A) A (B)
Eastbound B (B) B (C)
Overall B (A) B (B)Results for AM(PM)
This study is an operational assessment, not an engineering design. Roundabouts generally have greater ROW impacts
Dulles Toll Road Westbound Ramps
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Year 2030 HCM 2010 2015 ModelNorthbound A (A) A (A)
Southbound B (F - 178 sec) B (F - 109 sec)
Westbound B (B) C (C)
Overall B (E) B (D)Results for AM(PM)
This study is an operational assessment, not an engineering design. Roundabouts generally have greater ROW impacts
Dulles Toll Road Westbound Ramps / Sunset Hills Road
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Year 2030 HCM 2010 2015 Model
Northbound B (B) B (A)
Southbound F - 535 sec (F - 220 sec)
F - 98 sec (C)
SE-bound B (F - 107 sec) B (E)
Westbound C (C) D (F - 100 sec)
Overall F – 175 sec (F – 80 sec) D (D)
Results for AM(PM)
Data for the new methodology is based off of 4-leg roundabouts.
This study is an operational assessment, not an engineering design. Roundabouts generally have greater ROW impacts
Crowell Road / Sunset Hills Road
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Year 2030 HCM 2010 2015 ModelNorthbound B (A) B (B)
Southbound F - 339 sec (B) F - 177 sec (A)
Eastbound A (B) B (B)
Westbound B (B) C (B)
Overall E (B) D (B)Results for AM(PM)
This study is an operational assessment, not an engineering design. Roundabouts generally have greater ROW impacts
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June 2016: 2030 ComparisonIntersection
Roundabouts SignalsNo Build Alt. 1A Alt. 1B Alt. 2 Alt. 3
OVERALL LOS AM (PM)Hunter Mill Rd. @Sunrise Valley Dr. D (D) C (D) C (D) D (D) D (D)
Hunter Mill Rd. @DRT EB Ramps C (C) B (B) B (B) B (B) B (B)
Hunter Mill Rd. @DTR WB Ramps C (E) - B (D) B (D) B (C)
Hunter Mill Rd. @DTR WB Ramps & Sunset Hills Rd. - D (D) - - -
Hunter Mill Rd. @Sunset Hills Rd.* D (D) - - D (C) -
Hunter Mill Rd. @Crowell Rd.** C (C) C (A) - C (C) -
Hunter Mill Rd. @Crowell Rd. / Sunset Hills Rd. - - D (B) - D (C)
LOS Standard = LOS D* Alt 2 in new location ** No Build includes the proffered signal at Crowell Road
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Next Steps • Perform a Roundabout Geometric Study
• Focusing right-of-way, constructability, & refined geometry• Evaluate New “Mix and Match” Alternative(s)• Further evaluate the feasibility of Sunset Hills Road
Realignment• Focusing on alignment & right-of-way
• Additional analysis based on Reston Network Analysis volumes for 2050
• Public meeting to update community on work in the fall
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Next Steps (cont.)• Select a preferred alternative
• Based on analysis and community feedback• Comprehensive Plan Amendment
• Public Hearings
• Potential Interchange Modification Report/study• If a roundabout alternative is selected as the
preferred alternative• Identify funding for the project
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Colvin Run Bridge• Bridge is structurally deficient and functionally
obsolete• Hunter Mill Road carries 7,900 vehicles daily
• Warrants a 2 lane bridge (VDOT considers one lane bridges acceptable for 400 vehicles per day)
• Construction will take place based on funding availability
• Community outreach will commence once VDOT has acquired funding for the design of the bridge
