HomeMy WebLinkAboutWOODRIDGE (ARAPAHOE FARM) PUD, PHASES TWO-FIVE - PRELIMINARY - 55-87E - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY Oli
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I
III i ARAPAHOE FARM
SITE ACCESS STUDY
IIIFORT COLLINS, COLORADO
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III ,
011
MARCH 1991
•
Prepared for:
WoodCraft Homes
1501 North Cleveland Avenue
Loveland, CO 80538
IIIPrepared by:
MATTHEW J. DELICH, P .E.
ill 3413 Banyan Avenue
Loveland, CO 80538
L . Phone : 303-669-2061
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I . Introduction
WoodCraft Homes is proposing to develop a residential area on.
approximately 135 acres , located east of Taft Hill Road and north
of Harmony Road in Fort Collins, Colorado . The site location is
shown in Figure 1 . It is proposed to be developed in seven phases
over a period of 7-8 years . This traffic study performs four
analyses which evaluate the operation at Level I - Phases 1 & 2;
111 Level II - Phases 3 & 4; Level III - Phases 5 & 6; and Level IV -
Phase 7 . The roads/streets which are primarily impacted by
Arapahoe Farm are Harmony Road, Taft Hill Road, and Shields Street.
The key intersections which will be impacted are : Harmony/Shields,
Harmony/Taft Hill , and Harmony/Arapahoe Farm Access .
Harmony Road is classified as a major collector on the Fort
Collins Master Street Plan. The segment between Shields Street and
Taft Hill Road is two lanes with a rural cross section. There is
an eastbound left-turn lane at the Shields intersection. There is
a westbound right-turn auxiliary lane at Regency Drive . The posted
speed in both directions is 35 mph. There is signal control at the
Harmony/Shields intersection and stop sign control on Harmony Road
at its intersection with Taft Hill Road.
Shields Street is classified as an arterial on the Fort
Collins Master Street Plan. It is a street of varying width south
III of Drake Road. It is proposed to have a four lane urban cross
section with turn lanes at appropriate locations in the future .
It is posted at 35 mph between Harmony Road and Horsetooth Road.
Taft Hill Road is classified as an arterial street on the Fort
Collins Master Street Plan. It has a two lane rural cross section
south of CR 38E. There are auxiliary lanes at some intersections .
The posted speed is 45 mph in the area near the Harmony/Taft Hill
intersection.
Land uses in this area are residential , school , and open
space . Residential and school uses are east of Arapahoe Farm.
Single family residential uses are west (Taft Canyon) and north
( Imperial Estates) of the site . There are residential and open
land uses south of Arapahoe Farm.
II . Existing Conditions
The most recent daily traffic counts near Arapahoe Farm were
obtained in 1989. These counts are one and two way volumes on
Shields Street, Harmony Road, Taft Hill Road, and CR 38E and are
shown in Figure 2 . Peak hour intersection counts were obtained in
1989 and in February 1991 . These counts are also shown in Figure
2 . Raw data is shown in Appendix A.
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1111 SITE LOCATION . • • Figure 1
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RECENT TRAFFIC COUNTS Figure 2
With the existing control at the various intersections, the
peak hour operation of those intersections is shown in Table 1 .
This operation is deemed acceptable, except for eastbound left
turns at the Taft Hill/CR 38 intersection. Acceptable operation
is defined as level of service D or better. Descriptions of level
•
of service from the 1985 Highway Capacity Manual for signalized and
unsignalized intersections are provided in Appendix B. Calculation
forms for the operation shown in Table 1 are provided in Appendix
C. Based upon available traffic counts, the Taft Hill/CR 38
intersection is at or very close to meeting traffic signal warrants
according to the charts shown in Appendix D.
Further analysis of the existing peak hour traffic volumes at
the Harmony/Taft Hill intersection indicates that the southbound
lane should be separated into a through lane and a left-turn lane ,
and the northbound lane should be separated into a through lane and
a right-turn lane . Widening for the southbound lane should occur
on the west side of Taft Hill Road and should be long enough to
include storage, deceleration, and taper for the left-turning
traffic plus adequate transition both north and south of the actual
left-turn lane. Widening for the northbound lane should occur on
the east side of Taft Hill Road and should be long enough to
include deceleration and taper for right-turning traffic . From,
observation, it appears that westbound Harmony Road functions with
right- and left-turn lanes . However, these functional lanes should
be striped on the pavement. These improvements will improve the.
safety and operation based solely on existing peak hour traffic
volumes .
III . Proposed Development
WoodCraft Homes is proposing to develop 432 single family
dwelling units on a parcel of land north of Harmony Road and east
of Taft Hill Road . A schematic site plan is shown in Figure 3 .
This development will occur in seven phases, culminating in 1998 .
Initial phases of the development are proposed to access existing
Harmony Road at a stop sign controlled intersection located 1800
feet east of Taft Hill Road. The ultimate plan shows Harmony Road
on a curvilinear alignment through Arapahoe Farm as shown in Figure
3 . The 1800 foot segment of Harmony Road, west of the south
horizontal curve, will be vacated once the connection to Taft Hill
Road at CR 38E is made . Future street plans show Harmony Road
continuing to the west on the CR 38E alignment, then turning to the
north to meet Overland Trail .
A. Trip Generation
Trip generation estimates for Arapahoe Farm were obtained from
Trip Generation, 4th Edition, ITE. The trip generation for
Arapahoe Farm was divided into four levels of development as shown
2
III
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1
Table 1
IIIExisting Peak Hour Operation
Level of Service (Delay)
�. Intersection AM PM
Harmony/Shields (signal ) B (10.7 s/v) B (11 . 6 s/v)
Harmony/Taft Hill (stop sign)
WB LT D C
WB RT A B
IIISB LT A A
Taft. Hill/CR 38E (stop sign)
III EB LT E F
EB RT A A
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Table 2
IIITrip Generation
IIIDaily A .M. Peak P.M. Peak
Land Use Trips Trips Trips Trips Trips
ill in out in out
Level I (1992) 1140 23 62 72 42
Phases 1 & 2
III 113 Single Family DU
Level II (1994)
990 20 54 62 36
Phases 3 & 4
98 Single Family DU
III Level III (1997) 1560 32 85 98 58
Phases 5 & 6
155 Single Family DU
Level IV (1998) 660 13 36 42 25
IIII Phase 7
66 Single Family DU
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TOTAL 4350 88 237 274 161
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TEMPORARY HARMONY / ARAPAHOE
FARM ACCESS "T" INTERSECTION
TO BE IN PLACE FOR LEVELS I THRU II/ .
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II . . ® - INTERSECTION NUMBER
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SITE PLAN Figure 3
,
in Table 2 . Table 2 shows trip generation on a daily and peak hour
basis .
B. Background Traffic
Background traffic is defined as the traffic that is and/or
I _ will be on the area streets that is not related to the proposed
development. The roads considered for the operations analysis are
Taft Hill Road, Harmony Road, and Shields Street .
Background traffic for impacted streets was projected for each
of the future years analyzed ( 1992, 1994, 1997 , 1998) . Background
traffic was projected to increase at 3 percent per year for all
future years . This rate of increase is normal for streets and
roads in the City of Fort Collins . It accounts for general traffic
growth and some level of continued development in the vicinity that
would also contribute to traffic growth. Other than Arapahoe Farm,
there are no major developments proposed in this area that: would
cause a dramatic increase in traffic volumes on the area streets .
Therefore, the growth factor methodology is a reasonable means of
projecting an increase in background traffic . Should a major
development occur which nullifies this methodology, then the
traffic study for that development should reflect both the proposed
development and the projections for Arapahoe Farm as reflected in
this site access study. In the case of traffic studies for future
developments, the Arapahoe Farm traffic becomes part of the
background traffic for that development.
C. Trip Distribution
Trip distribution was determined based upon an evaluation of
attractions for home-based productions and the most likely routes
available to travel to those attractions . The directional
distribution of the approaching and departing traffic generated at
Arapahoe Farm is a function of:
- Geographic location within the City of Fort Collins
- Location of employment and business centers which are likely
to attract trips from Arapahoe Farm
- Access to the site.
Figure 4 illustrates the trip distribution percentages used in the
subsequent traffic assignments .
D. Traffic Assignment and Intersection Operation
Using the vehicular trip generation estimates presented in
Table 2, the site generated traffic was assigned to the area street
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network. The initial network consisted of Harmony Road, Shields
Street, and Taft Hill Road as they are today. The analyzed
intersections were Harmony/Shields with the existing signalization,
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TRIP DISTRIBUTION Figure 4
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Harmon Taft Hill with control ,stop sign g and a Harmony/Arapahoe .
Farm Access T intersection with stop sign control . The Harmony/ '
Arapahoe Farm Access intersection location is shown in Figure 3 .
This will be a temporary access to Harmony Road used just to serve
Arapahoe Farm as it goes through its phased development. This
traffic study will go through an iterative assignment process using
III the development levels shown in Table 2 and Figure 3 . At each
iteration ( level of development) , the operation at the key
III intersections was evaluated. When unacceptable operation is
reached at the Harmony/Arapahoe Farm Access intersection, it is
recommended that Harmony Road be connected to Taft Hill Road at the .
CR 38E intersection as is proposed in the Arapahoe Farm Master
III Plan.
Figure 5 shows the Level I ( 1992) peak hour traffic
IIIassignment. This assignment also includes a 3 percent per year
increase in background traffic as described earlier in this report.
Table 3 shows the peak hour operation at the key intersections .
III Calculation forms are provided in Appendix E. Only the westbound
left turn at the Harmony/Taft Hill intersection will experience
unacceptable operation during the morning peak hour. Detailed
examination of the analysis shows that this level of operation
would occur even without this level of development of Arapahoe
— Farm. The unacceptable operation at this intersection during a
s :. single hour of the day is attributed to the increase in background
traffic on Taft Hill Road. Since this intersection will be
eliminated in the next 7 years, this operation, though termed
11.1
unacceptable , should be accepted . It is recommended that the
temporary Harmony/Arapahoe Farm Access have the following
® geometrics :
! - Southbound left-turn lane
- Southbound right-turn lane
- Westbound right-turn lane (310 feet including taper)
Eastbound left-turn lane (310 feet including taper)
No additional improvements are required at either the Harmony/
IIIShields or Harmony/Taft Hill intersections over the recommendations
/ made under the "Existing Conditions" discussion.
Figure 6 shows the Level II (1994) peak hour traffic
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assignment which includes the background traffic on the area
streets . Table 4 shows the peak hour operation at the key
intersections . Calculation forms are provided in Appendix F. Only
111 the westbound left-turn at the Harmony/Taft Hill intersection will
experience unacceptable operation during the morning peak hour.
This level of operation would occur even without the Level II
development of Arapahoe Farm. The auxiliary lanes recommended i.n
III the Level I discussion at the Harmony/Arapahoe Farm Access
intersection will provide safe, efficient movement of traffic . No
additional improvements are required at any of the key
III
intersections . .
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PEAK HOUR TRAFFIC WITH
HARMONY / ACCESS "T" INTERSECTION Figure 5
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Table 3
1992 (Level I) Peak Hour Operation
Level of Service (Delay)
Intersection AM PM
Harmony/Shields (signal) B (12. 3 s/v) B (14. 5 s/v)
Harmony/Taft Hill (stop sign)
WB LT E D
WB RT A B
SB LT A A
Harmony/Arapahoe Farm Access
(stop sign)
SB .LT B B SB RT A A
EB LT A A
} Table 4
� 4 ,•; 1994 (Level. II) Peak Hour Operation
I P -
Level of Service (Delay)
Intersection AM PH
Harmony/Shields (signal ) B (13 . 3 s/v) B (15 .6 s/v)
Harmony/Taft Hill (stop sign)
WB LT E D
WB RT A B
SB LT A A
Harmony/Arapahoe Farm Access
(stop sign)
SB LT B C
SB RT A A
EB LT A A
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1994 (LEVEL lit )
PEAK HOUR TRAFFIC WITH
1111 HARMONY / ACCESS "T" INTERSECTION Figure 6
17
Figure 7 shows the Level III (1997) peak hour traffic
assignment which includes background traffic on the area streets .
Table 5 shows the peak hour operation at the key intersections .
Calculation forms are provided in Appendix G . Only the westbound
left-turn at the Harmony/Taft Hill intersection will experience
- unacceptable operation during the morning and afternoon peak hours .
— This level of operation would occur even without the Level III
development of Arapahoe Farm. No additional improvements are
required at any of the key intersections .
Figure 8 shows the Level IV (1998) peak hour traffic
assignment, which includes background traffic, on the area streets.
Table 6 shows the peak hour operation at the key intersections .
Calculation forms are provided in Appendix H. At this level of
development of Arapahoe Farm, the Harmony/Arapahoe Farm Access
intersection begins to experience unacceptable operation. It is
recommended that Harmony Road be connected to Taft Hill Road at CR
t'.. 38E. Throughout the phased development of Arapahoe Farm, Harmony
Road will be built to an arterial four lane cross section. It is
at this final phase that the aforementioned connection should he
made and the connection at,the east property line of Arapahoe Farm
to the existing Harmony road should also be made . Since the
segment through Arapahoe Farm will be built to an arterial
standard, it is recommended that a 0 . 6 mile segment between
Arapahoe Farm and Shields Street also be built to an arterial
standard. It is expected that the unfinished portion of Harmony
Road, east of Shields, will be built to an arterial standard. The
segment of existing Harmony Road from the Arapahoe Farm Access
location to Taft Hill Road should be vacated.
Given the above recommendations, the traffic assignment shown
in Figure 9 was performed. This shows the peak hour traffic at the
various intersections along Harmony Road and the two key
intersections on Taft Hill Road. Traffic volumes at the Harmony/
Shields intersection will be as indicated in Figure 8 . Table 7
shows the peak hour operation at the key intersections .
Calculation forms are provided in Appendix I . The signalized
intersections are expected to operate acceptably. The stop sign
controlled intersections that are along Harmony Road and the Taft
Hill/Brixton intersection will operate acceptably. The recommended
geometrics at the Harmony/Shields intersection are 1 left-turn
lane, 1 through lane, and 1 through/right-turn lane on all legs .
Consideration should be given to providing a separate westbound
right-turn lane due to the existing and future number of right
turns at this location. The recommended geometrics at the various
intersections , which are along Harmony Road in Arapahoe Farms and
the adjacent intersections along Taft Hill Road, are shown in
Figure 10 . Design of these
g g geometrics used criteria contained in
the "Intersection Channelization Design Guide, " NCHRP Report 279,
TRB, 1985 . The speed on Harmony Road was assumed to be 35 mph.
5
11
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is 28/55 —'1c1//3'18 - 59/13'1
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AM/PM
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1997 (LEVEL DI
, 7 PEAK HOUR TRAFFIC WITH
HARMONY / ACCESS "T" INTERSECTION Figure 7
1111
Table 5
III1997 (Level III ) Peak Hour Operation
Level of Service (Delay)
Intersection AM PM
Harmony/Shields (signal ) C ( 16. 6 s/v) C ( 17 . 1 s/v)
Harmony/Taft Hill (stop sign)
;,;,;. WB LT E E
III WB RT A C
SB LT C A
III{ Harmony/Arapahoe Farm Access
(stop sign)
SB LT C D
'' ,' SB RT A A
EB LT A A
Ili
1,
'ar%, .. Table 6
1998 (Level IV) Peak Hour Operation
g� Level of Service (Delay)
Intersection AM PM
p-,77
Harmony/Shields (signal ) C (18 .4 s/v) C (23 . 8 s/v)
tr' Harmony/Taft Hill (stop sign)
t, WB LT E E
WB RT A D
SB LT C A
t:
h, Harmony/Arapahoe Farm Access
1 (stop sign)
,.a�u. SB LT D E
SB RT A A
✓, a EB LT A A
I,
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tt
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7 t 30/94—� HARMONY 94/64 —/ )
I 453/235— 0- 551/255 —R� I 7
pi o 0-1 "19/5b —�
0 c+1
1111 Ns to 0
111,
11
rt .
It .
AM/PM
L''',',', ,
IN
t!'..?
1998 (LEVEL
PEAK HOUR TRAFFIC WITH
HARMONY / ACCESS "T" INTERSECTION Figure 8
N
-6,
Il . .
v N m L I"Z/338
CO. RD. ) -♦—,5/47
II 38E /
I 210/u.4 --f yg9/y0
5Z/31 --a i 2�/sC
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4Z/3o a-
� s i \Illi NdP. O
`"�^N '90
7:7rs ' 0I.
ems _ .
p3 �?O0'ti 6BRIXTON) I �L� �39/2.5—, ) 1 I c+
PI MOH. --a. \-II/i
39/Zl--k a Q -. ,e 2o/14
11111
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_ sN0 �IOM.
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akI\� 3
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AM/PM /33$ \-0' /3/gs�
/
HARMONY ROAD
11111
ii
1998 (LEVEL ' )
," PEAK HOUR TRAFFIC WITH HARMONY ROAD
pi
COMPLETED THROUGH ARAPAHOE FARM Figure 9
FT
c 14°`'-° Table 7
1998 (Level IV) Peak Hour Operation ,
*i with the completion of Harmony Road
�kn.,i„
Level of Service (Delay)
'' ,,' 4 Intersection AM PM
Harmony/Shields (signal ) C ( 17 . 3 s/v) C ( 18 .7 s/v)
_ (improved geometrics and
s, - 8 phase signal )
k Harmony/Taft Hill/CR 38E (signal ) B (13 . 3 s/v) B ( 11 . 3 s/v)
Harmony/Seneca (stop sign)
SB LT C D
„"',_" SB RT A A
? ::" EB LT A A
Harmony/Intersection 1 (stop sign)
. EB LT/T/RT B B
WB LT/T/RT C C
SB LT A A
,.r4.G,:F,:r' NB LT A A
Harmony/Inter-section 2 (stop sign)
$k EB LT/T/RT B B
WB LT/T/RT B C
SB LT A A
,.. NB LT A A
, ,F-':
Harmony/Intersection 3 (stop sign)
WB LT/RT B C
'. SB LT A A
Harmony/Intersection 4 (stop sign)
4, r EB LT/T/RT A A
,, WB LT/T/RT B C
j,. SB LT A A
r,. NB LT A A
Taft Hill/Brixton (stop sign)
EB LT B C
r—FT EB T/RT A A
ditr ''.` WB LT B C
i'.t WB T/RT A A
SB LT A A
, NB LT A A
.6-
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+ •
1 .
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38eI• ' b
\ )(--050,_zod)+T
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+ _, ) e
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BRIXTON) i \ er-- _-- -- '
ill —if fr
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-
HARMONY ROAD.
1...T:',...'...,_
,,,,r,
Figure 10
RECOMMENDED GEOMETRICS
E. Signal Warrants
Signals will not be warranted at Harmony Road intersections
1 , 2, 3, and 4, at the Harmony/Seneca intersection, or the Taft
Hill/Brixton intersection. A signal may be warranted at the
Harmony/Seneca intersection in the future, when land to the south
of Harmony Road develops and Seneca connects to Taft Hill Road.
This evaluation should be the subject of future traffic studies
when these things occur. The Harmony/Taft Hill/CR 38E intersection
will likely meet signal warrants in a few years, perhaps as soon
as the Harmony Road connection is made . If a signal is installed
at this location prior to the Harmony connection, the construction
of the signal should allow this leg to be retrofitted into the
-,, -� intersection signalization scheme .
III . Conclusions
Ism
The following summarizes the significant findings as a result
of this study:
Arapahoe Farm, at full development, will generate
approximately 4350 daily trip ends . These can be handled on the
area streets with various improvements .
ter`" - Traffic operation at the area intersections is acceptable
except for the eastbound left-turns at the Taft Hill/CR 38E
intersection. This intersection is close to meeting signal
°° ilK warrants and should be monitored regularly. The Harmony/Taft Hill
intersection should be fitted with the following auxiliary lanes :
- 1) southbound left-turn lane, 2) northbound right-turn lane, and
0 3) westbound right-turn lane and left-turn lane.
Ara hoe Farm will a' initial access to Harmony Road at
-,T, a T intersection near Seneca btreet (extended) .
- At Level I ( 1992) development of Arapahoe Farm, the key
n ,�w intersections operate acceptably, except for westbound left-turns
at the Harmony/Taft Hill intersection in the morning peak hour.
t' This operation is attributed to the increase in background traffic .
The following auxiliary lanes should be built at the
�];f; 4 Harmony/Arapahoe Farm Access : 1 ) southbound right-turn lane, 2)
tkl' ' " southbound left-turn lane, 3) westbound right-turn lane, and 4)
al "I > eastbound left-turn lane .
" +ern
x A0v At Level II (1994) and Level III (1997) development of
- ,1, i ° Arapahoe Farm, the key intersections will operate acceptably,
j a �x except for the same westbound left turns at the Harmony/Taft Hill
intersection. No additional improvements are required at the
completion of these levels of development .
it I �
Ihrvi,
At Level IV (1998) development of Arapahoe Farm,
unacceptable operation is experienced at the Harmony/Arapahoe Farm
Access intersection. It is recommended that. Harmony Road be
completed at an arterial cross section through Arapahoe Farm,
connecting to Taft Hill Road at CR 38E. It is recommended that
existing Harmony Road, from approximately Seneca Street to Taft
Hill Road, be vacated. It is recommended that Harmony Road be
built to an arterial cross section from the east property line of
Arapahoe Farm through Shields Street.
- The key intersections within and adjacent to Arapahoe Farm
will operate acceptably when considering the 1998 (full
development) traffic, along with an increase in background traffic .
The geometrics shown in Figure 10 are recommended for the
intersections along Harmony Road. The Harmony/Taft Hill/CR 38E
intersection should be signalized.
7