HomeMy WebLinkAboutVILLAGE ON REDWOOD (FORT COLLINS HOUSING AUTHORITY) - PDP - PDP150012 - SUBMITTAL DOCUMENTS - ROUND 2 - VARIANCE REQUEST1218 W. ASH, STE. A, WINDSOR, COLORADO 80550
TEL. 970.674.3300 – FAX 970.674.3303
August 12, 2015
Mr. Marc Virata
City of Fort Collins – Engineering
PO Box 580
281 North College Avenue
Fort Collins, Colorado 80522-0580
RE: Village on Redwood – Redwood Street Sight Distance Variance
Dear Marc:
Fort Collins Housing Authority is proposing a low income housing development along
the west side of Redwood Street (classified as a Minor Collector street) and is surrounded
by residential development. This project is required to establish sight distance triangles
and easements per the Minor Collector standards and design speeds. A variance is
requested from Table 7-3 “Fort Collins (GMA and City Limits) Street Standards –
Technical Design Criteria” and Figure 7-16 “Sight Distance (Sight Triangle)” in the
Larimer County Urban Area Street Standards to allow the project to apply the sight
distances for a roadway design speed of 40 mph in reference to AASHTO’s current
A Policy on Geometric Design of Highways and Streets.
Redwood Street currently does not meet the standards for a Minor Collector street which
creates difficulty applying the LCUASS sight distance standards. Below is a table
summarizing the existing conditions of Redwood Street in reference to LCUASS for a
Minor Collector street:
Existing
Redwood St
Minor
Collector
Local
Residential
Centerline Radius (ft) 395 600 275
Centerline Tangent between Curves (ft) 65 100 100
Centerline Radius (ft) 375 600 275
Design/Posted Speed Limits (mph) 25 posted
40 design
25-30 posted
30 design
25 posted
Sight Distance (ft) - 660 260
Driveway Acess Unlimited Limited Unlimited
LCUASS Minimum
Existing / Standards Comparison
Village on Redwood
Redwood Street Sight Distance Variance
August 18, 2015
Page 2 of 2
The current geometry of Redwood Street is somewhere between the Local Residential
and Minor Collector standards with the speed limit posted as 25 mph.
Rather than requesting a reduction in design speed in reference to the existing geometry
of Redwood, we reviewed the sight distance calculations in reference to current (2011)
AASHTO edition of A Policy on Geometric Design of Highways and Streets. Below is a
table comparing the LCUASS and AASHTO sight distances:
Attached is an exhibit showing the AASHTO sight distance triangles for both proposed
accesses to Redwood Street.
In consideration of the existing geometry of Redwood Street, we do not anticipate that
this variance will be detrimental to the public health, safety, or welfare. Please call me at
(970) 347-8917 should you have any questions or require any additional information for
the approval of this variance.
Sincerely,
Jason T. Claeys, P.E., LEED AP
Project Manager
Speed LCUASS Left Turning Right Turning
30 mph 260 335 290
35 mph 310 390 335
40 mph 660 445 385
AASHTO
Sight Distance Comparison
PREPARED FOR
PROJ. NO.
DATE:
SCALE (H):
SCALE (V):
CHECKED BY:
DESIGNED BY:
PROJECT NAME
VILLAGE ON REDWOOD
SIGHT DISTANCE EXHIBIT
08/12/15
1"=100'
N/A
JTC
RA
1237-112-00
1 of 1
FORT COLLINS HOUSING AUTHORITY
1715 WEST MOUNTAIN AVE.
FORT COLLINS, CO 80521
970.416.2910
SCALE 1" =
0
60'
30 60
SOUTH DRIVE
NORTH DRIVE
LEGEND