HomeMy WebLinkAboutCOBBLESTONE CORNERS PUD - PRELIMINARY - 55-87E - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY •
111
MEMORANDUM
co
•
o To: Joe Shrader, Deines Lumber
a N oc Andrea Dunlap, ReMax
o Fort Collins Transportation Division
u m Fort Collins Planning Department
• m
From: Matt Delich
Date: May 24, 1993
Subject: Mountainridge Farm Traffic Study Update
(File : 9331MEM1 )
a
a It has been proposed to change the site development plan
for Mountainridge Farm in Fort Collins, Colorado. In the
m previous Mountainridge Farm development plan, the northwest
quadrant of the Shields/Wabash (future) intersection was
proposed to have a church site. This parcel is proposed to
be changed to a residential use, containing 40 patio home
dwelling units : Figure 1 shows a schematic of the site plan,
showing the location of the parcel that will contain the 40
dwelling units .
In the Mountainridge Farm Site Access Study, April 1992,
the land use on the subject property was a church. Table 1
shows the trip generation for the church site as reported in
the site access study. Also shown in .Table 1 is the trip
generation for the 40 patio homes . The patio homes will
generate more traffic on both a daily and peak hour basis
relative to the church use . However, the absolute increase
z in traffic is very small .
2
Figure 2 shows the Phase 1 peak hour traffic at the key
intersections, with the 40 patio homes on the former church
W site . This graphic corresponds to Figure 6 from the site
- > access study. Table 2 shows the peak hour operation at the
key intersections . Calculation forms are provided in Appendix
® A. The key intersections will operate similarly to that
reported in Table 3 of the site access study. Left-turn exits
a
w.� with stop sign control from the minor streets will operate at
w o level of service E using the unsignalized intersection
o a technique from the 1985 Highway Capacity Manual . Based upon
arecent research (provided in Appendix B) , these left-turns
—4 g operate at levels of service C and D during the peak hours .
® This operation should be accepted.
3t U
u.� a Figure 3 shows the Phase 1 and 2 peak hour traffic at the
H cc
I- key intersections with the 40 patio homes on the former church
site . This graphic corresponds to Figure 7 from the site
2E access study. Table 3 shows thepeak hour operation at the
� P
key intersections . Calculation forms are provided in Appendix
411
C. The key intersections will operate similarly to that reported
in Table 4 of the site access study. Based upon the recent
research, all intersections will operate at level of service D or
better.
At the new Shields/Wabash intersection, the following geometry
is recommended: 1) southbound Shields - one through lane and one
right-turn deceleration radius and taper' (radius >40 ' and taper =
240' ) ; 2) northbound Shields - one through lane and one left-turn
deceleration/storage lane (325 feet including taper) ; 3) eastbound
Wabash - one left-turn lane (50 feet) and one right-turn lane; and
4) westbound Wabash - one lane . This development will be required
to build the west half of Shields Street to an arterial cross
section. Assuming that existing Shields Street is centered in the
right-of-way, there will be 41 feet of pavement adjacent to the
Mountainridge Farm property. Wabash Street intersects Shields
Street 80 feet south of the north property line. Some of the
southbound taper paving will occur along a portion of Shields
Street that is not adjacent to Mountainridge Farm. The other
aforementioned auxiliary lanes can be striped on the new pavement
area.
It is concluded that changing the church site to 40 patio
homes will not significantly change the operation at the key
intersections .
Table 1
Trip Generation
Daily A.M. Peak P.M. Peak
Land Use Trips Trips Trips Trips Trips
in out in out
Church Site 190 2 1 9 8
40 Patio Homes 235 3 15 15 7
1The southbound through and right-turn volumes do not warrant
a full width deceleration lane based upon criteria in "Intersection
Channelization Design Guide, " NCHRPR 279, TRB, 1985, Pg 63-65 . The
taper will allow right-turning vehicles to enter the taper slowing
to 15 mph to make the turn.
• 4 •
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SOUTH SHIELDS STREET
I - NO SCALE
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40 Patio ❖°°�•'°'� •
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(former • •-�� °°; ;„ 4#440 •
Church site) O;p ° s°i 4e
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Phase 3 •
2 SENECA •
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lithi
Johnson
Westfield Park Elementary
School
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MOUNTAINRIDGE FARM SITE PLAN Figure 1
1
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oo , c.
\,,N , -189/393
" ---168/593
+ --122/138 HORSETOOTH
128 38--� t re
536/314— ■•• N 4,
19 29--� �c\
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29/16—' f
Mountainridge
Farm/ J
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�—23/20 TROUTMAN
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AM / PM
PHASE 1 PEAK HOUR TRAFFIC Figure 2
Ilk 411
Table 2
Phase 1 (1995) Peak Hour Operation
Level of Service ( * )
Intersection AM PM
Horsetooth/Shields (signal) C C
Shields/Troutman
WB LT E (C/D) E (D)
WB RT C B
SB LT A B
Shields/Wabash
EB LT E (D) E (D)
EB RT A B
SB LT A A
(* ) Level of service considering recent research pertaining to
vehicle delay.
Table 3
Phase 1 and 2 (1995) Peak Hour Operation
Level of Service ( * )
Intersection AM PM
Horsetooth/Shields (signal ] C C
Shields/Troutman
WB LT E (C/D) E (D)
WB RT C B
SB LT A B
Shields/Wabash
EB LT E (D) E (D)
EB RT A B
SB LT A A
( * ) Level of service considering recent research pertaining to
vehicle delay.
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towc��
N N IL-189/393
"I'"' "r +-168/593
) i L /r-123/142 HORSETOOTH
128/38-' ' t 11
536 314--® o r-
19/3o m
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e/d"/7-'1 . Itsa ; 44/28--/ 4
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Mountainridge
Farm/ 0
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2 N '-133/75
ii=23/20 TROUTMAN
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00
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AM / PMr.
PHASE 1 & 2 PEAK HOUR TRAFFIC Figure 3