HomeMy WebLinkAboutBRIDGEFIELD P.U.D. - PRELIMINARY - 45-94 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDYBridgefield/West Prospect Patio Homes Traffic Impact Analysis
Signal Warrant Analysis: The City requested that a signal warrant analysis be performed
at the new entrance of the proposed project with West Prospect Road to determine whether
a signal at this intersection would ever be warranted. The signal warrants analysis is based
on Warrant 11 - Peak Hour Volume fort the Manual of Uniformed Traffic Control Devices
(MUTCD).
The MUTCD peak hour warrant is based on a sliding scale comparing the sum of both the
major street approaching volumes with the greater minor street approaching volume. As the
major street volumes increase, the conflicting minor street becomes less to warrant a signal.
The MUTCD, however, has a 100 volume minimum for a lower threshold for the minor street.
�j As previously presented, the peak hour outbound movement from the project to West
Prospect Road is approximately 35 vehicles in the a.m. peak hour which is about one-third
the minimum threshold for warranting a signal. Therefore, the project as proposed will not
warrant a signal at this location.
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Bridgefield/1Nest Prospect Patio Homes Traffic Impact Analysis
3. Although there will be some delay to make this movement, the demand for this
movement is only 4 vehicles per hour in the AM and 2 in the PM. This volume
is insignificant in perspective of all the remaining vehicles traveling through this
intersection with excellent levels of service.
It is however, proposed, that the lane configuration for the outbound movement be of
sufficient width to accommodate a separate left turn, so as to not impact and delay the heavy
right turn movement out of the site.
Year 2015 Peak Hour Analysis
In addition to the existing plus project traffic impact analysis, the City of Fort Collins requested
a year 2015 peak hour analysis of the intersection of West Prospect Road and Bryan Avenue.
The 2015 forecasts were based on 2015 forecasts from the Centre for Advanced Technology
Site Access Study prepared by Mathew J. Delich, P.E. in May of 1994. The resulting a.m.
and p.m. peak hour traffic forecasts and resulting level of service analysis is presented in
Table D as follows:
Table D - Year 2015 Plus Project West Prospect/Bryan Intersection Level of Service
Intersection
AM
PM
Vol.
LOS
Vol
LOS
■u
North Bound Left
4
E
2
E
North Bound Through
-
D
-
E
,1
North Bound Right
31
A
17
A
■�
South Bound Left
53
E
47
E
South Bound Through
-
D
-
E
South Bound Right
3
A
11
A
^I
East Bound Left
6
A
3
B
Eastbound Through
1,113
-
541
-
Eastbound Right
1
-
3
-
Westbound Left
6
C
31
A
Westbound Through
257
-
955
-
West Bound Right
26
-
62
-
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BridgefieldNNest Prospect Patio Homes Traffic Impact Analysis
Existing Plus Project Traffic Level of Service: The resulting existing plus project peak
hour levels of service for the intersections of West Prospect Road at Bryan Avenue and
Shields Street are presented in Table C.
Table C - Existing Plus Project Intersection Level of Service
Level of Service
Intersection
AM
PM
West Prospect Road/Bryan Ave. (Two Way Stop)
North Bound Left
D
D
North Bound Through
D
D
North Bound Right
A
A
South Bound Left
E
E
South Bound Through
D
D
South Bound Right
A
A
East Bound Left
A
A
West Bound Left
B
A
West Prospect Road/Shields Street (Signal)
D
D
As can be seen, west bound left turns into the site and northbound right turns out of the site
will operate at excellent levels of service. The northbound left turn out of the site is measured
at level of service "E". Based on Merrick's observations, it is our opinion that this will not be
a significant impact for the following three reasons:
1. The unsignalized intersection level of service analysis methodology used is
based on random arrival rates, which predict the probability in a vehicle having
a sufficient gap to make a left turn from a minor street to a major street.
Observations on Prospect indicate a direct correlation of platooning to up and
down stream signals. In between these platoons, gaps are available for
making left turns.
2. Prospect has a continuous left turn lane, which allows vehicles making a left,
to turn into the left turn lane, accelerate and move into the travel stream. The
LOS methodology is not sensitive to continuous left turn lanes.
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
Figure 5 - Total Traffic
O
n West Prospect Road c0 N
ter-_
26/62
171 /688.J I
6/3 1
6/3 2161117
981 /420 7611358 �-►
1 /3 92/71
n
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Project Site
Legend: AM/PM Peak Hour
k� 130/275
254/644
134/465
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
Figure 4 - Project Traffic
(D
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West Prospect Road
~_ 6/31
1/3 t
�► 1
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Project Site
Legend: AM/PM Peak Hour
LO
kam�
4=mm 4/21
1
5/3
21/11
5/3 Lo
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
Table B - Project Trip Generation
AM AM AM PM PM PM
UNITS ADT IN OUT TOTAL IN OUT TOTAL
Trip Generation Rates
Single Family DU 9.55 .19 .55 .74 .66 .35 1.01
Patio Homes DU 5.86 .07 .37 .44 .36 .19 .55
Trip Generation
Single Family 5 48 1 3 4 3 2 5
Patio Homes 87 510 6 32 38 31 17 48
Total 92 558 7 35 42 34 19 53
Trip Distribution: The trip distributions for the proposed project is based in part on the
location of the project within proximity to the City of Fort Collins and in part on the existing
traffic counts collected at the intersection of South Bryan Avenue. Currently and in the
anticipated future, the majority of jobs and shopping are located to the east of the project.
Based on the traffic counts of the existing residential development to the north of West
Prospect Road, it became apparent that a significant majority of the residential traffic in this
area travels east on West Prospect to Shields. At Shields, the predominant movement is
eastbound on West Prospect Road with some traveling north and south on Shields.
Based on field count observations it was estimated that approximately 90 percent of the
arriving and departing traffic would be to/from the east on West Prospect and 10 percent
to/from the west on West Prospect. Of the 80 percent traveling to/from the east, 60 percent
were estimated to continue east of Shields on Prospect and 15 percent would travel to/from
the north and 15 percent travel to/from the south on Shields.
Trip Assignment: Applying the trip distribution percentages times the a.m. and p.m. peak
hour trip generation yields the project traffic volumes as presented in Figure 4. Adding the
project traffic with the existing a.m. and p.m. peak hour traffic yields the existing plus project
traffic volumes as presented in Figure 5
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
Figure 3 - Existing Traffic Volumes
d
m
Ch
m
L
Cn
West Prospect Road OwC4
M LO 26/62 � 130/275
�....�� 171 /688 4J 1 250/623
134/465
6/3 211/114
981 /420 740/347
87/68 CO
00
1 N
1
1
Project Site
Legend: AM/PM Peak Hour
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
Traffic Volumes: Existing a.m. and p.m. peak hour turn movement traffic volumes for the
intersections of West Prospect Road and South Bryan Avenue. Existing a.m. and p.m.
peak hour traffic volumes for West Prospect Road and Shields Street were provided by the
City of Fort Collins Transportation Division. These volumes are used in the intersection
level of service analysis and the signal warrant analysis and are presented graphically in
Figure 3.
Existing Levels of Service: Intersection level of service analysis was performed at the two
intersections under investigation. Level of Service (LOS) is a grading system as to how
well an intersection operates, ranging from "A" which is excellent to "F" failure. LOS of
"D" or better is the City of Fort Collins threshold for being acceptable.
The existing levels of service for the intersections analyzed are based on the 1985
Highway Capacity Manual and are presented in Table A. The calculations sheets for this
analysis is presented in the appendix of this report. As can be seen, level of service "E"
occurs for southbound left turns from Bryan to Prospect. This is do to the heavy
east/west traffic on Prospect. It should be noted that based on observations, the traffic
along Prospect tends to be in platoons, allowing gaps in traffic for the southbound
movement to occur.
Table A -Existing Intersection Level of Service
Level of Service
Intersection AM PM
West Prospect Road/Bryan Avenue (Two Way Stop)
South Bound Left E E
South Bound Right A A
East Bound Left A A
' West Prospect Road/Shields Street (Signal) D D
IProject Impacts
Trip Generation: The a.m. and p.m. peak hour trip generation rates for the proposed single
family residential units are based on the single family detached residential land use
designation from the Institute of Transportation Engineers 5th edition of the Trip Generation
Manual. The patio homes were based on the residential condominium/townhouse designation.
The trip generation rates and resulting trip generation for the proposed project are presented
in the following table.
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
Figure 2 - Site Plan
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
1
1 BRIDGEFIELD/WEST PROSPECT PATIO HOMES
1 Introduction
1 The following traffic impact analysis is for the proposed Bridgefield/West Prospect Patio
Homes development located on the south side of West Prospect Road at the intersection
with South Bryan Avenue. The location of this site is presented in Figure 1. As will be
1 presented, the analysis evaluates the impacts of the proposed project traffic when added
to existing a.m. and p.m. peak hour traffic conditions at the intersection of West Prospect
Road at Bryan Avenue and Shields Street. This analysis also examines the 2010
conditions at the intersection of West Prospect Road and Bryan Avenue. Based on this
analysis, no significant traffic impacts were identified and the intersections evaluated will
operate at acceptable levels of service without and with project traffic. Furthermore, the
' traffic study will indicate that the project traffic will not warrant a signal at the
intersection of West Prospect Road and Bryan.
' Project Description
The proposed project site plan is presented in Figure 2. The proposed project consists of
t a maximum number of 92 units. This includes 53 Patio Homes north of the Larimer
County Canal, 34 Patio Homes south of the canal and five single family dwelling units off
of West Stuart. Primary access to the proposed project will be via the fourth leg of the
' intersection of West Prospect Road and South Bryan. Access to the five single family
dwelling units will be via West Stuart Street. Secondary emergency access will be
available via the Heatheridge Lake Condominium site to the east of the proposed
' development. The product is proposed to be appointed with upper end amenities with 70
percent directed to empty nesters.
' Existing Conditions
Roadway Characteristics: West Prospect Road is a four lane roadway and is designated
1 Major Arterial in the City of Fort Collins Urban Growth Area Master Street Plan. West
Prospect has a designated 35 mile per hour speed limit and has a continuous left turn lane
and improved curb, gutter and sidewalks. As previously mentioned, the entrance to the
proposed project will be the fourth leg of an existing local two lane residential street with
parking to the north, South Bryan Avenue.
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Bridgefield/West Prospect Patio Homes Traffic Impact Analysis
TABLE OF CONTENTS
PAGE
1
Introduction..................................................
1
Project Description .............................................
1
Existing Conditions .............................................
1
Roadway Characteristics ....................................
4
Traffic Volumes ..........................................
Levels of Service .........................................
4
4
Project Impacts ...............................................
4
Trip Generation ...........................................
Trip Distribution ..........................................
6
Trip Assignment ..........................................
6
Level of Service ..........................................
9
Year 2015 Peak Hour Analysis ....................................
10
11
Signal Warrant Analysis ........................................
LIST OF FIGURES
1.
Vicinity Map ...............................................
2
2.
Site Plan .................................................
3
3.
Existing Traffic Volumes
.......................................
5
4.
Project Traffic ..............................................
7
5.
Total Traffic ...............................................
8
LIST OF TABLES
A.
Existing Intersection Level of Service ..............................
4
B.
Project Trip Generation .......................................
6
C.
Existing Plus Project Intersection Level of Service .....................
9
D.
Year 2015 Plus Project Intersection Level of Service ..................
10
Appendix: Level of Service Analysis
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BRIDGEFIELD/WEST PROSPECT PATIO HOMES
TRAFFIC IMPACT ANALYSIS
August 22, 1994
Presented to
Lagunitas Company
Prepared by
Merrick & Company
19 Old Town Square Suite 238
Fort Collins, Colorado 80524
rF-
❑❑❑
11011 MERRICK
❑❑❑ 6-4ne�&A�iteas
Merrick & Company
19 Old Town Square / Sume 238
Fort Collins. Colorado / 80520 / USA
303/221.0887
August 22, 1994
Mr. Jonathan J. Prouty
Lagunitas Company
3307 S. College Avenue, Suite 200
Fort Collins, CO 80525
RE: Bridgefield / Traffic Study
Dear Mr. Prouty:
Merrick and Company is pleased to provide you with this Traffic Impact Analysis for the
proposed Lagunitas Company residential development south of Prospect Street at the
intersection with Bryan Avenue.
Based on the City of Fort Collins Traffic Impact Analysis guidelines and with
discussions with Eric Bracke and Tom Vossberd in Transportation Services, the impact
analysis has been conducted and includes the following elements and attachments:
1. Project data: See attachment A regarding the discussion of the proposed
type of development, a project vicinity map, project description and a site plan that
shows the proposed land uses.
2. Base Traffic: See attachment B regarding daily and peak hour trip
generation, a study area map showing the existing street system and traffic control,
existing and projected traffic volumes and level of service. This analysis focuses on
the intersections of Prospect Street at Bryan Avenue and Shields Street including
peak hour traffic counts, level of service analysis both for existing and for existing plus
project and 2010 conditions.
3. Project Traffic Analysis: Attachment C analyzes the existing and future
transportation system including street system operations and traffic control devices.
If you have any questions or need any further services in regard to your project, do not
hesitate to contact me.' 1.
Sincerely,
Ray Moe
Senior Transportation Planner