Hunter Mill Road and Sunset Hills Road Study-Community Meeting #4 June 29, 2016

1. Hunter Mill Road and Sunset Hills
Road Study
Community Meeting #4
Progress Update
June 29, 2016
Kristin Calkins
Fairfax County Department of Transportation

2. Presentation Agenda
• Project Objectives
• Summary of Community Comments
• Review of Developed Alternatives
• Traffic Analysis Results
• Next Steps
• Colvin Run Bridge
• Questions and Answers
2

3. 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
3

4. Project Study Area
4
Intersection ID Intersection
Current
Intersection
Control Type
1
Hunter Mill Road at
Sunrise Valley Drive
Signalized
2
Hunter Mill Road at
DTR EB Ramps
Signalized
3
Hunter Mill Road at
DTR WB Ramps
Signalized
4
Hunter Mill Road at
Sunset Hills Road
Signalized
5
Hunter Mill Road at
Crowell Road
Unsignalized
(All-Way Stop)
6
Hunter Mill Road at
Hunting Crest Lane
Unsignalized
(Two-Way Stop)
7
Hunter Mill Road at
Lake Fairfax Park
Unsignalized
(Two-Way Stop)
7
6
5
43
2
1

5. 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
5

6. Project Process
24 MONTHS
6
We are Here

7. 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
7

8. 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
8

9. Alternatives Developed
9
Crowell Road
Sunset Hills Road
Sunrise Valley Drive
HunterMillRoad
WB DTR
EB DTR
No-Build
Crowell Road
Sunset Hills Road
Sunrise Valley Drive
HunterMillRoad
WB DTR
EB DTR
Alt. 1A
Crowell Road
Sunset Hills Road
Sunrise Valley Drive
HunterMillRoad
WB DTR
EB DTR
Alt. 1B
Roundabout
Signal Proffered

10. Alternatives Developed (Cont.)
10
Crowell Road
Sunset Hills Road
Sunrise Valley Drive
HunterMillRoad
WB DTR
EB DTR
No-Build
Crowell Road
Sunset Hills Road
Sunrise Valley Drive
HunterMillRoad
WB DTR
EB DTR
Alt. 2
Crowell Road
Sunset Hills Road
Sunrise Valley Drive
HunterMillRoad
WB DTR
EB DTR
Alt. 3
Signal Proffered

11. May 2015: 2030 Comparison
11
Intersection
Roundabouts Signals
No 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

12. 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
12

13. Sunrise Valley Drive Intersection
13
Year 2030 HCM 2010 2015 Model
Southbound 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

14. Dulles Toll Road Eastbound Ramps
14
Year 2030 HCM 2010 2015 Model
Northbound 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

15. Dulles Toll Road Westbound Ramps
15
Year 2030 HCM 2010 2015 Model
Northbound 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

16. Dulles Toll Road Westbound Ramps / Sunset Hills Road
16
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

17. Crowell Road / Sunset Hills Road
17
Year 2030 HCM 2010 2015 Model
Northbound 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

18. June 2016: 2030 Comparison
18
Intersection
Roundabouts Signals
No 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

19. 19
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

20. 20
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

21. 21
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

22. 22
Question & Answers
Kristin.Calkins@Fairfaxcounty.gov
http://www.fairfaxcounty.gov/fcdot/huntermillstudy.htm