The document outlines findings from a community meeting regarding traffic congestion and improvement alternatives for Hunter Mill Road and Sunset Hills Road. The project aims to address existing congestion, enhance access to Dulles Toll Road, and maintain the character of Hunter Mill Road through context-sensitive solutions. Multiple alternatives including roundabouts and traffic signals are explored, with plans for public input and a preferred alternative presentation scheduled for mid-July 2015.

1. Hunter Mill Road and Sunset Hills
Road Study
Community Meeting #3
Analysis Findings
May 20, 2015

2. Presentation Agenda
• Introductions
• Project Objectives
• Summary of Prior Community Involvement
• Build Alternatives
• Future Traffic Analysis
• Questions and Answers
• Next Steps
2

3. Introductions
• County Staff
• Consultant Team (RK&K)
3

4. 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
4

5. Project Background
• Board of Supervisors requested study
• “No Build” includes proffered improvements
from the Oakcrest School rezoning
• Two meetings held thus far:
o December 8, 2014: Kick-Off
o February 24, 2015: Existing & No-Build
conditions and community input on
alternatives
5

6. Project Process
8 MONTHS
6
We are Here

7. Project Study Area
7
Intersection ID Intersection
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
4
3
2
1

8. Summary of Community Comments
• Do not want traffic from Wiehle Avenue diverted
to Hunter Mill Road
• Concerns that the signal at Crowell Road may
increase delays in the off-peak
• Roundabouts should be seriously examined as an
alternative for the corridor
• Keep Hunter Mill Road’s character the same
• Concern that improvements may attract more
traffic
8

9. 9
Response to Community Questions
• Will these improvements attract vehicles to Hunter
Mill Road?
o Trips will divert from Hunter Mill Road and use Crowell. The
improvement will not add new trips to the road network, but
divert local trips.
• Can more lanes be accommodated under the
existing Toll Road Structures?
o More lanes cannot feasibly be accommodated under the DTR.
The piers for the Dulles Access Road are load bearing and
would need to be replaced. Replacement of just the two
bridges would be near $40 million, not including the cost of
improving Hunter Mill Road.

10. 10
Response to Community Questions
• Will a signal at Crowell Road and Hunter Mill Road
increase delays in the off peak?
o An actuated signal can be used in the off peak to minimize
the delays of vehicles on Crowell Road.
• Why not consider moving the ramps of the Dulles
Toll Road?
o Prior to modifying the ramp termini of the Dulles Toll Road
all viable and workable alternatives need to be tested to
see if they work. Changing the Toll Road intersections is a
last step measure to improve the corridor as it would
require a federal review and a much more time consuming
process.

11. 11
Community Input on Alternatives
• Test an all Roundabout Solution
• Test extending the right turn lane on southbound
Hunter Mill Road before the intersection of
Sunrise Valley Drive
• See if additional lanes can be added underneath
the Dulles Toll Road
• Test a realigned Sunset Hills Road
• To a mid point between the current location and Crowell
Road
• To Crowell Road

12. Future Conditions - Geometry
• Hunter Mill Road
Minor Arterial (Type B)
o 1 Lane in each direction (north of Sunset Hills Road)
o 2 Lanes Northbound, 1 Lane Southbound (south of Dulles
Toll Road)
o 35 miles per hour speed limit
• Sunrise Valley Drive
o Minor Arterial (Type B)
o 1 Lane in each direction (East of Hunter Mill Road)
o 2 Lanes in each direction (West of Hunter Mill Road)
o 35 miles per hour speed limit
12

13. Future Conditions - Geometry
13
• Sunset Hills Road
o Minor Arterial (Type B)
o 2 Lanes in each direction
o 35 miles per hour speed limit
• Crowell Road
o Minor Arterial (Type B)
o 1 Lane in each direction
o 35 miles per hour speed limit

14. Alternatives Developed
14
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

15. Alternatives Developed
15
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

16. 16
Alternative 1A
Intersection Type
Sunrise Valley Drive Roundabout
Eastbound Dulles Toll Road Roundabout
Westbound Dulles Toll Road
& Sunset Hills Road
Roundabout
Crowell Road Roundabout

17. Alternative 1A
17
Sunrise Valley Drive DTR EB Off/On Ramps

18. Alternative 1A (Cont.)
18
DTR WB off/On Ramps Crowell Road/Relocated Sunset Hills Rd

19. 19
Alternative 1B
Intersection Type
Sunrise Valley Drive Roundabout
Eastbound Dulles Toll Road Roundabout
Westbound Dulles Toll Road Roundabout
Sunset Hills Road Realigned to
Crowell Road
Roundabout

20. Alternative 1B
20
Sunrise Valley Drive DTR EB Off/On Ramps

21. Alternative 1B (Cont.)
21
DTR WB off/On Ramps Crowell Road/Relocated Sunset Hills Rd

22. 22
Alternative 2
Intersection Type
Sunrise Valley Drive Signalized
Eastbound Dulles Toll Road Signalized
Westbound Dulles Toll Road Signalized
Sunset Hills Road – moved north Signalized
Crowell Road Signalized

23. Alternative 2
23
Sunrise Valley Drive DTR EB Off/On Ramps

24. Alternative 2 (Cont.)
24
DTR WB off/On Ramps & Relocated Sunset Hills Crowell Road

25. 25
Alternative 3
Intersection Type
Sunrise Valley Drive Signalized
Eastbound Dulles Toll Road Signalized
Westbound Dulles Toll Road Signalized
Sunset Hills Road Realigned to
Crowell Road
Signalized

26. Alternative 3
26
Sunrise Valley Drive DTR EB Off/On Ramps

27. Alternative 3 (Cont.)
27
DTR WB off/On Ramps Crowell Road/Relocated Sunset Hills Rd
Need new
graphic

28. AM 2030 Comparison
28
Intersection Approach
AM Peak Hour
No Build Alternative 1A Alternative 1B Alternative 2 Alternative 3
Delay LOS Delay LOS Delay LOS Delay LOS Delay LOS
Hunter Mill Road at
Sunrise Valley Drive
SB 24.2 C 8.2 A 8.2 A 23.0 C 23.2 C
EB 46.8 D 13.5 B 13.5 B 46.7 D 43.3 D
WB 44.0 D 17.4 B 17.4 B 41.8 D 41.5 D
Overall 38.1 D 13.2 B 13.2 B 36.9 D 35.9 D
Hunter Mill Road at
Dulles Toll Road EB Ramps
NB 20.5 C 16.9 B 16.9 B 16.2 B 16.4 B
SB 19.8 B 4.8 A 4.8 A 17.1 B 16.4 B
EB 74.8 E 11.8 B 11.8 B 59.6 E 55.7 E
Overall 30.6 C 12.3 B 12.3 B 18.7 B 18.4 B
Hunter Mill Road at
Dulles Toll Road WB Ramps
NB 27.3 C - - 5.3 A 4.7 A 6.5 A
SB 3.5 A - - 14.6 B 3.9 A 6.9 A
WB 62.4 E - - 15.9 B 47.8 D 42.8 D
Overall 29.8 C - - 11.0 B 15.4 B 15.9 B
Hunter Mill Road at
Dulles Toll Road WB Ramps at
Sunset Hills Road
NB - - 14.9 B - - - - - -
SB - - 535.0 F - - - - - -
WB - - 21.8 C - - - - - -
SEB - - 13.3 B - - - - - -
Overall - - 174.7 F - - - - - -
Hunter Mill Road at
Sunset Hills Road*
NB 31.5 C - - - - 32.5 C - -
SB 31.2 C - - - - 36.1 D - -
EB 84.4 F - - - - 56.0 E - -
Overall 41.1 D - - - - 38.0 D - -
Hunter Mill Road at
Crowell Road**
NB 13.2 B 20.0 B - - 19.0 B - -
SB 21.1 C 64.1 E - - 19.5 B - -
WB 42.1 D 12.4 B - - 49.5 D
Overall 24.7 C 29.0 C - - 29.2 C - -
Hunter Mill Road at
Crowell Road / Sunset Hills
Road
NB - - - - 13.1 B - - 30.9 C
SB - - - - 338.7 F - - 70.8 E
EB - - - - 9.8 A - - 42.9 D
WB - - - - 19.2 B - - 44.8 D
Overall - - - - 70.9 E - - 43.8 D
* Alt 2 in new location
** No Build includes the proffered signal at Crowell Road

29. PM 2030 Comparison
29
Intersection Approach
PM Peak Hour
No Build Alternative 1A Alternative 1B Alternative 2 Alternative 3
Delay LOS Delay LOS Delay LOS Delay LOS Delay LOS
Hunter Mill Road at
Sunrise Valley Drive
SB 38.7 D 8.3 A 8.3 A 34.1 C 32.7 C
EB 64.6 E 177.3 F 177.3 F 54.1 D 56.4 E
WB 34.3 C 8.2 A 8.2 A 38.0 D 34.6 C
Overall 48.8 D 77.4 E 77.4 E 43.1 D 42.8 D
Hunter Mill Road at
Dulles Toll Road EB Ramps
NB 16.9 B 13.1 B 13.1 B 18.1 B 17.9 B
SB 19.5 B 4.8 A 4.8 A 11.8 B 11.4 B
EB 65.1 E 16.4 B 16.4 B 56.5 E 49.6 D
Overall 25.9 C 10.0 A 10.0 A 17.0 B 16.4 B
Hunter Mill Road at
Dulles Toll Road WB Ramps
NB 97.4 F - - 6.4 A 29.3 C 20.6 C
SB 21.3 C - - 178.0 F 30.7 C 38.6 D
WB 105.2 F - - 15.9 B 51.3 D 48.9 D
Overall 73.1 E - - 68.6 E 36.0 D 34.9 C
Hunter Mill Road at
Dulles Toll Road WB Ramps at
Sunset Hills Road
NB - - 10.3 B - - - - - -
SB - - 220.3 F - - - - - -
WB - - 22.5 C - - - - - -
SEB - - 106.6 F - - - - - -
Overall - - 80.4 F - - - - - -
Hunter Mill Road at
Sunset Hills Road*
NB 14.6 B - - - - 24.5 C - -
SB 59.4 E - - - - 2.8 A - -
EB 93.3 F - - - - 49.5 D - -
Overall 53.4 D - - - - 27.2 C - -
Hunter Mill Road at
Crowell Road**
NB 14.9 B 6.1 A - - 12.4 B - -
SB 19.6 B 9.9 A - - 20.4 C - -
WB 40.9 D 11.2 B - - 49.5 D - -
Overall 26.1 C 8.6 A - - 28.1 C - -
Hunter Mill Road at
Crowell Road / Sunset Hills
Road
NB - - - - 9.4 A - - 33.9 C
SB - - - - 10.8 B - - 26.7 C
EB - - - - 10.2 B - - 36.7 D
WB - - - - 11.5 B - - 34.5 C
Overall - - - - 10.4 B - - 30.0 C
* Alt 2 in new location
** No Build includes the proffered signal at Crowell Road

30. 30
Findings/Conclusions
• Signalized Alternatives performs best at Hunter
Mill Road and Sunrise Valley Drive
• All alternatives approximately same at DTR
eastbound ramps
• Alternative 1A (roundabout with DTR Ramp and
Sunset Hills Road) performs the worst at DTR
westbound ramps

31. 31
Findings/Conclusions (Cont’d)
• The signalized alternatives perform best at DTR
westbound ramps
• Sunset Hills Road operates best when realigned
to the north
• Corridor likely not “One Size Fits All” – Mix and
match of alternatives might be solution

32. 32
Alternative Comparison
WB DTR
Ramps &
Sunset
Hills
Crowell
Road
ROW
Alternative 2 Alternative 3
Sunrise
Valley
Drive
EB DTR
Ramps
WB DTR
Ramps &
Sunset
Hills
Crowell
Road
Sunrise
Valley
Drive
EB DTR
Ramps
WB DTR
Ramps &
Sunset
Hills
Crowell
Road
Sunrise
Valley
Drive
EB DTR
Ramps
WB DTR
Ramps &
Sunset
Hills
Crowell
Road
Sunrise
Valley
Drive
EB DTR
Ramps
Alternative 1A Alternative 1B
COST
LOS
Alternative 1A Alternative 1B Alternative 2 Alternative 3
ROW
Cost
LOS
Better
Average
Worse

33. 33
Questions
• 30 Minutes
• Please limit yourself to one question so others
have an opportunity to ask
Comments and Questions are requested to be
received by Friday, June 5, 2015 to:
Kristin.Calkins@fairfaxcounty.gov

34. Summary and Next Steps
• Public meeting to present preferred alternative
o Tentatively mid-July
• Final Recommendations and Report
• Plan amendment to integrate preferred alternative
into the Comprehensive Plan
34

35. Project Timeline
Task No. Description
0
Finalize Scope
Consultant Selection
Contracting/Issue NTP
1
Establish Existing Conditions
Kick off meeting
Public/Stakeholder Meeting
Summary Document on Existing Conditions
2
Develop MOEs
Preliminary Concepts
Public/Stakeholder Meeting
Finalize Concepts
Summary Document on Alternatives
3
Preliminary Assessment of Alternatives
Final Assessment of Alternatives
Public/Stakeholder Meeting
Summary Document on Alternatis Analysis
4
Chapter 1 (draft)
Chapter 2 (draft)
Chapter 3 (draft)
Chapter 4 (draft)
Chapter 5 (draft)
Technical Appendices
Final Report & Project Files
Deliverables Meetings Working Time
December January February March April May June July
December 2014 - July 2015
October November
Existing Conditions
Develop Alternatives & MOEs
Alternatives Analysis
Documentation
Scoping
We are here
35