HomeMy WebLinkAboutSDP201900009 Review Comments Final Site Plan and Comps. 2019-06-06 (4)COMMONWEALTH of VIRGINIA
DEPARTMENT OF TRANSPORTATION
16o1 orange Road
Cuipeper Virginia 22701
Stephen C. Brich, P.E.
Commissioner
June 6, 2019
County of Albemarle
Department of Community Development
401 McIntire Road
Charlottesville, VA 22902
Attn: Megan Nedostup
Re: Pleasant Green Phase 1 — Final Site Plan
SDP-2019-00009
Review #2
Dear Ms. Nedostup:
The Department of Transportation, Charlottesville Residency Transportation and Land Use
Section, has reviewed the above referenced plan as submitted by Collins Engineering, revised 3
May 2019, and offers the following comments:
1. Notes on the plans reference proposed "VDOT Standard Mini Roundabout", please
clarify.
2. Please refer to the NCHRP Report 672, as well as the FHWA document "Roundabout:
An Informational Guide" for roundabout design guidance.
3. Roundabout size should be determined by Sidra Intersection and auto -turn analyses.
Provide that analysis, including fastest path diagrams.
4. There does not appear to be enough deflection at the approaches to reduce the vehicle
speed entering the roundabout.
5. Please see attached roundabout sight distance guidance document and provide all
referenced sight distance scenarios within roundabout on plans.
6. Required signage for roundabouts include the outside yield sign and the right chevron
sign in the center island at each approach.
7. The intersection of Farmhouse Road, Blue Ridge Avenue, and McComb Street should be
a T-intersection.
8. Provide ROW for turnaround at intersection of Dupree Street and private alley.
9. Why does the typical section of Farmhouse Road remain consistent throughout when
there are areas of parking on one side only and areas of no parking? Parking areas should
be established with a bumpout.
10. Please remove parking pavement markings and hatching as they will not be maintained.
Signage should be used to establish areas of no parking vs parking.
11. Street trees cannot be within 30 feet of curb radii at intersections.
VirginiaDOT.org
WE KEEP VIRGINIA MOVING
June 6, 2019
Megan Nedostup
Page 2
Please provide two copies of the revised plan along with a comment response letter. If further
information is desired, please contact Justin Deel at 434-422-9894.
A VDOT Land Use Permit will be required prior to any work within the right-of-way. The
owner/developer must contact the Charlottesville Residency Transportation and Land Use
Section at (434) 422-9399 for information pertaining to this process.
Sincerely,
Adam J. Mo e, P.E.
Area Land Use Engineer
Charlottesville Residency
VirginiaDOT.org
WE KEEP VIRGINIA MOVING
Roundabouts: An Informational Guide
Exhibit 6-SS
Stopping Sight Distance
on the Approach
Exhibit 6-56
Stopping Sight Distance
on Circulatory Roadway
Exhibit 6-57
Sight Distance to
Crosswalk on Exit
LEGEND
d Stopping eight distance /
related to approaching speed
LEGEND
of Distance related to stopping
sight distace and circulatory
speed
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Page 6-62
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Chapter 6/Geometric Design
Roundabouts: An Informational Guide
6.7.3.2 Intersection Sight Distance
Intersection sight distance is the distance required for a driver without the right-
of-way to perceive and react to the presence of conflicting vehicles. Intersection sight
distance is achieved through the establishment of sight triangles that allow a driver to
see and safely react to potentially conflicting vehicles. At roundabouts, the only loca-
tions requiring evaluation of intersection sight distance are the entries.
Intersection sight distance is traditionally measured through the determination
of a sight triangle. This triangle is bounded by a length of roadway defining a limit
away from the intersection on each of the two conflicting approaches and by a line
connecting those two limits. For roundabouts, these legs should be assumed to fol-
low the curvature of the roadway, and thus distances should be measured not as
straight lines but as distances along the vehicular path.
Intersection sight distance should be measured using an assumed height of
driver's eye of 3.5 ft (1,080 mm) and an assumed height of object of 3.5 ft (1,080 mm)
in accordance with the AASHTO "Green Book" (4) which is based upon NCHRP
Report 383: Intersection Sight Distances (20).
Exhibit 6-58 presents a diagram showing the method for determining inter-
section sight distance. As can be seen in the exhibit, the sight distance triangle has
two conflicting approaches that must be checked independently. The following
two subsections discuss the calculation of the length of each of the approaching
sight limits.
LEGEND
d, Entering stream distance
dp Circulating stream distance
I,
50 R (f5 ng
6.7.3.3 Length of Approach Leg of Sight Triangle
The length of the approach leg of the sight triangle should be limited to 50 ft
(15 m). British research on sight distance has determined that excessive intersection
sight distance results in a higher frequency of crashes. This value, consistent with
British and French practice, is intended to require vehicles to slow down prior to
entering the roundabout, which supports the need to slow down and yield at the
roundabout entry and allows drivers to focus on the pedestrian crossing prior to
Entries to mundaboufS
require adequate lntersecdon
sight distance.
Exhibit 6-58
Intersection Slght Distance
Chapter 6/Geometric Design
Page 6-63
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