HomeMy WebLinkAboutHEARTHFIRE (HOFFMAN) - OVERALL DEVELOPMENT PLAN - 31-95 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDYN �
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(OBTAINED FROM LARIMER COUNTY-6/95) FIGURE 2
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FIGURE 1
VICINITY MAP
Hoffman Traffic Impact Analysis
State Highway 1
In the State Highway Access Code, general criteria for speed change lanes can be found
(Section 4.7.1, pf 29). These include criteria for right turn acceleration/deceleration lanes.
Based upon the existing conditions at the intersection of State Highway 1 and Douglas Road,
a deceleration and acceleration lane is needed for the northbound right turns during the p.m.
peak hour. The proposed development will increase the number of right turns and add to this
problem. With the proposed development, an acceleration and deceleration lane will be
necessary in both the a.m. and p.m. peak hours. It is apparent that modifications are
necessary under existing conditions.
Cul-de-sac at Inverness Street.
The alternative which includes the construction of a cul-de-sac at Inverness Street will result
in the diversion of additional traffic to State Highway 1. This additional traffic will worsen the
already existing problem. The preferred solution would be to not cul-de-sac Inverness Street
and minimize the additional traffic at the intersection of State Highway 1 and Douglas Road.
MERRICK & COMPANY 11
Hoffman Traffic Impact Analysis
Highway 52 at County Rd 11 (Stop
Control)
Southbound Left
A
A
Northbound Left
A
A
Eastbound Left
A
A
Eastbound Through
A
A
Eastbound Right
A
A
Westbound Left
A
A
Westbound Through
A
A
Westbound Right
A
A
Other Potential Impacts: Although the existing+cumulative+project traffic volumes at the
intersections are low and within acceptable levels of service, other impacts will be seen on
the roadway system due to this project.
Inverness/Abbotsford Street
Inverness Street and Abbotsford street are currently two lane dirt roads running from the
proposed project connection at County Road 13 southwest to Gregory Road. Inverness
Street turns into Abbotsford Street. These are very low volumes roads that carry local traffic
to/from Gregory Road. Based upon trip generation, this project will generate 2400 trips daily.
Approximately 40 percent of these trips will use the Inverness/Abbotsford connection to
Gregory Road. This results in approximately 950 additional daily trips on Inverness Street
and Abbotsford Street. These volumes exceed the general standards for when a dirt road
should be paved. An alternative solution may be to cul-de-sac Inverness Street at County
Road 13. The downside to this alternative is
1) People currently using Inverness Street would be precluded from doing so
2) A cul-de-sac requires diversionof traffic to State Highway 1
MERRICK & COMPANY 10
Hoffman Traffic Impact Analysis
Level of Service: The resulting existing plus cumulative plus project peak hour levels of
service for the intersections described are presented in Table D. As can be seen, acceptable
levels of services prevail at all intersections in both the a.m. and p.m. peak hour conditions
with the addition of project traffic.
Table D - Existing + Cumulative + Project Levels of Service (LOS)
Douglas Rd at County Rd 13 (Stop
Control)
Eastbound Left
A
A
Westbound Left
A
A
Northbound Left
A
A
Northbound Through
A
A
Northbound Right
A
A
Southbound Left
A
A
Southbound Through
A
A
Southbound Right
A
A
State Highway 1 at Douglas Rd 11 (Stop
Control)
Northbound Left
A
A
Southbound Left
A
A
Eastbound Left
B
D
Eastbound Through
A
B
Eastbound Right
A
A
Westbound Left
C
C
Westbound Through
A
B
Westbound Right
A
A
MERRICK & COMPANY 9
a
Hoffman Traffic Impact Analysis
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 Cumulative Year 2000 a.m. and p.m. peak hour traffic yields the Year
2000 plus project traffic volumes as present in Figure 6.
MERRICK & COMPANY 8
Trip Generation
Rates
Single Family
Residential
Apartments
Trip Generation
Single Family
Residential
Apartments
Hoffman Traffic Impact Analysis
Table C - Project Trip Generation
AM AM AM PM PM PM
UNITS ACT IN OUT TOTAL IN OUT TOTAL
DU 10 .19 .55
DU 6.5 .09 .42
74 .66 .35 1.01
51 .43 .2
142 1420 27 78 105 94 50
147 956 13 62 75 63 29
.63
143
93
Total 2376 40 140 180 157 79 236
Trip Distribution: The trip distributions for the proposed project are based in part on the
location of the project within the City of Fort Collins and in part on existing residential traffic
patterns determined from the review of the existing traffic counts. Based on the existing
counts at the intersection of County Road 13 and Douglas it appears that approximately half
of the traffic goes west towards State Highway 1 with of one quarter of traffic continuing north
on County Road 13 and the remainder turning east on Douglas Road. The proposed Hoffman
development consists of residential development and this report assumes that the majority
of the peak hour traffic will be attempting to go south towards Fort Collins. It is estimated that
approximately 5 percent of the project traffic will travel north, 40 percent will travel south on
College Avenue, 40 percent will travel south on Lemay Avenue, and 15 percent will connect
to 1-25. The project trip distributions are shown in Figure 5.
MERRICK & COMPANY 7
Hoffman Traffic Impact Analysis
Highway 52 at County Rd 11 (Stop
Control)
Southbound Left
A
A
Northbound Left
A
A
Eastbound Left
A
A
Eastbound Through
A
A
Eastbound Right
A
A
Westbound Left
A
I A
Westbound Through
A
A
Westbound Right
A
A
Project Impacts
The following project impact section generates traffic for the proposed development, defines
where trips will go to/from, assigns those trips to the intersections under investigation and
evaluate impacts.
Trip Generation: The a.m. and p.m. peak hour trip generation rates for the proposed
residential units are based on the single-family and multi -family residential land use
designation from the Institute of Transportation Engineers 5th edition of the Trip Generation
Manual. As shown in the following Table C approximately 2400 average daily trips will be
generated by this project. Approximately 180 a.m. peak hour trips will be generated along
with approximately 240 p.m. peak hour trips.
MERRICK & COMPANY 6
Hoffman Traffic Impact Analysis
Table B - Cumulative Levels of Service (LOS)
Douglas Rd at County Rd 13 (Stop
Control)
Eastbound Left
A
A
Westbound Left
A
A
Northbound Left
A
A
Northbound Through
A
A
Northbound Right
A
A
Southbound Left
A
A
Southbound Through
A
A
Southbound Right
A
A
State Highway 1 at Douglas Rd 11 (Stop
Control)
Northbound Left
A
A
Southbound Left
A
A
Eastbound Left
A
C
Eastbound Through
A
B
Eastbound Right
A
A
Westbound Left
B
C
Westbound Through
A
B
Westbound Right
A
A
MERRICK & COMPANY 5
Hoffman Traffic Impact Analysis
Highway 52 at County Rd 11 (Stop
Control)
Southbound Left
A
A
Northbound Left
A
A
Eastbound Left
A
A
Eastbound Through
A
A
Eastbound Right
A
A
Westbound Left
A
A
Westbound Through
A
A
Westbound Right
A
A
Year 2000 Cumulative Traffic Conditions
To evaluate the project in a future condition scenario, a three percent annual growth rate was
assumed for a year 2000 cumulative condition. A connection from the collector street within
the proposed development will be made to County Road 13.
The estimated year 2000 traffic volumes are presented in Figure 3. The resulting levels of
service are presented as follows. Growth in traffic does not results in unacceptable levels of
service.
MERRICK & COMPANY 4
Hoffman Traffic Impact Analysis
Table A - Existing Levels of Service (LOS)
Douglas Rd at County Rd 13 (Stop
Control)
Eastbound Left
A
A
Westbound Left
A
A
Northbound Left
A
A
Northbound Through
A
A
Northbound Right
A
A
Southbound Left
A
A
Southbound Through
A
A
Southbound Right
A
A
State Highway 1 at Douglas Rd 11 (Stop
Control)
Northbound Left
A
A
Southbound Left
A
A
Eastbound Left
A
B
Eastbound Through
A
A
Eastbound Right
A
A
Westbound Left
A
B
Westbound Through
A
A
Westbound Right
I A
A
MERRICK & COMPANY 3
Hoffman Traffic impact Analysis
The three intersections described can accommodate a left/through/right, on each of the four
legs.
Inverness Street and Abbotsford street are currently two lane gravel roads running from the
proposed project connection at County Road 13 southwest to Gregory Road.
Existing Traffic Volumes: Existing a.m and p.m. peak hour turn movement traffic volumes
for the intersection of State Highway 1 and Douglas Road, County Road 13 and Douglas
Road and County Road 11 and Country Club Road in June, 1995. These volumes are used
in the intersection level of service analysis and are presented graphically in Figure 2.
Existing Levels of Service: Intersection level of service analysis was performed at three
intersections including State Highway 1 and Douglas Road, County Road 13 and Douglas
Road and County Road 11 and Country Club Road. Level of Service (LOS) is a grading
system as to how well an intersection operates, ranging from "A" which is excellent to "F"
failure.
The existing levels of service for the intersections analyzed are based on the 1985 Highway
Capacity Manual and are presented in Table A. The calculation sheets for this analysis are
presented in the appendix of this report. As can be seen, acceptable levels of service were
found at each of the intersections.
MERRICK & COMPANY 2
Hoffman Traffic Impact Analysis
Introduction
The following preliminary traffic impact analysis is for the proposed Hoffman multi -family and
single-family residential development located near the intersection of County Road 13 and
Douglas Road in the City of Fort Collins (Figure 1). As will be presented, this preliminary
analysis first evaluates existing a.m. and p.m. peak hour traffic conditions assuming current
lane geometrics and traffic control at the intersections of County Road 13/Douglas Road,
Colorado State Highway 1/Douglas Road and County Road 11/Serramonte. The second
analysis evaluates year 2000 conditions without the project. The third analysis is year 2000
plus project analysis. Project traffic is generated, distributed and assigned to the year 2000
traffic.
Project Description
The proposed project consists of 142 single-family residential dwelling units and 147 multi-
family residential dwelling units. Sixty-three of the multi -family dwelling units are located
above the garages of sixty-three of the proposed single-family as noted on the site plan. The
project site is located north of Richard's Lake. The boundaries of the site are Douglas Road
on the north, County Road 13 on the west, existing residential development on the east, and
Richard's Lake to the south. Primary access to the proposed project will be via a proposed
residential street on the west edge of the site which will tie into County Road 13. Secondary
access will be via a connection to the proposed Richards Lake development, southeast of the
proposed project, available upon completion of the Richards Lake development.
Existing Conditions
Roadway Characteristics: Currently, Douglas Road is a two lane paved facility with a
posted speed limit of 35 mph. As a part of this development, improvements will be made
to Douglas Road. County Roads 13 and 11 are two lane gravel graded facilities with posted
speed limits of 30 mph. Colorado State Highway 1 is a two lane paved facility with a posted
speed limit of 45 mph. In the vicinity of Douglas Road/SH1, the shoulders on Colorado State
Highway 1 are very wide and used as right turn lanes by travelers.
MERRICK & COMPANY 1
Hoffman Traffic Impact Analysis
TABLE OF CONTENTS
PAGE
Introduction............................................................. 1
Project Description....................................................... 1
Existing Conditions....................................................... 1
Existing Plus Cumulative Year 2000 Conditions ................................... 4
Project Impacts (Trip Generation, Distribution, Assignment) .......................... 6
Level of Service Analysis ................................................... 9
Other Potential Impacts ................................................... 10
LIST OF FIGURES
1. Project Location...................................................... 12
2. AM/PM Peak Hour Existing Traffic Volumes ................................. 13
3. AM/PM Peak Hour Year 2000 Cumulative Traffic Volumes ........................ 14
4. AM/PM Peak Hour Project Traffic Volumes ................................... 15
5. Project Trip Distribution ................................................. 16
6. AM/PM Peak Hour Existing + Cumulative + Project Traffic Volumes ................. 17
LIST OF TABLES
A. Existing Levels of Service ................................................ 3
B. Cumulative Level of Service ............................................... 5
C. Project Trip Generation ................................................. 7
D. Existing + Cumulative + Project Levels of Service .............................. 9
APPENDIX:
A. LEVEL OF SERVICE ANALYSIS
B. TRIP DISTRIBUTION AND ASSIGNMENT
MERRICK & COMPANY ii
Draft
HOFFMAN PUD
TRAFFIC IMPACT ANALYSIS
June 19, 1995
MERRICK & COMPANY
00o MERRICK
Engineers& Architects.
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