HomeMy WebLinkAboutPINECONE PUD THE TOWER SHOPPES SONIC DRIVE IN PRELIMINARY - 60 91N - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDYTraffic Impact Study
Sonic Drive -In
At Tower Shoppes PUD
Fort Collins, Colorado
June 24, 2005
Prepared for:
Scott Beard
1015 West Horsetooth Rd, Suite 202
Fort Collins, CO 80526
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Sonic Drive-in at Tower Shoppes
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Table 2 — Trip Generation
Land Use
ITE
Units
Daily
Total Trips
Enter / Exit Distribution
Code
Trips
Noon PM
Noon I PM
IN OUT IN , OUT
Sonic Drive -In
na
19
—1,900
269
112
122
147
57
55
bays
20% reduction for mode split and
380
54
22
24
29
11
11
pass -by
Total
—1,520
215
90
98
118
46
1 44
Development Trip Distribution and Assignment
The next step in the traffic analysis for this development is to distribute and assign the new trips generated
by the development onto the street network. This was accomplished by analyzing the existing traffic
patterns within the study area, thmiking through likely destination and travel patbs, speaking with city staff,
utilizing professional engineering judgaant and then applying the resultant distribution. Due to the
restrictive turning movements at the existing access locations, inbound and outbound distribution
percentages at those kxations are not the same. The distEibubm penCEILMM are shown m Figure 6 and 7.
Figure 6 — Inbound Site Generated Trip Distribution
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Figure 7 — Outbound Site Generated Trip Distribution
The assignment of the site generated traffic to the surrounding roadways is based upon the distribution
percentage and is shown in Figure 8 for the noon and evening peak hour periods of an average weekday.
These assignments are made by applying the trip generation estimates of Table 2 to the trip distribution
percentages of Figures 6 and 7. The noon and evening peak hour traiirc volumes are m vehicles per hoar
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Figure 8
— Site Generated Trip Assignment
noon /pm mmeber of w7 in8 weluctes
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4. FUTURE TRAFFIC VOLUMES AND CAPACITY ANALYSIS
Background Traffic Projections.
Based upon the Larimer County Urban Area Street Standards, the short-term horizon year will be in 2010
and the longterm horizon will be 2025. 'Phis requires the background traffic (area traffic volumes) to be
forecast to the horizon years. Based upon the scoping meeting, all existing area traffic will be increased by
1.5% per year to account for regional growth -
Figure 9 and 10 show the non -site, or background traffic at the key intersections for the short-term horizon
year of 2010 and the longterm horizon of 2025, respectively.
site
2051 W9
201 to
,313 1. 3 xt/.2
1../l.]"'ns/ W
E. HomebM Rd.
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Figure 9 — 2010 Background Volumes
noon/pm number ofturmng vehicles
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Sonic Drive-in at Tower Shoppes
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Figure 10 — 2025 Background Volumes
noon /pm number ofwmng vekteles
.Total Traffic Proiections
' The addition of the background traffic volumes in each time horizon to the site traffic results in the total
expected traffic volumes at the key intersections. For the short -tam horizon, the turning volumes in Figure
9 were added to those in Figure 8. For the long-term horizon, background volumes in Figure 10 were
added to those in Figure 8.
The total traffic volumes are shown in Figure 11 for the short-term horizon and Figure 12 for the long-term
' horizon.
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Sonic Drive -In at Tower Shoppes
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Figure 11—
2010 Total Volumes
I
noon/pm numberofhu7nng vehicles
I 0�
1115
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Figure 12
— 2025 Total Volumes
U
noon/pm
number of burning vehicles
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Sonic Drive -In at Tower Shoppes
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Operational Analysis
A Level of Service (LOS) analysis was completed at each of the intersections in both the noon and pm peak
how. The LOS was calculated both without the project development (background only) and with the
development traffic (total), allowing for a comparison between scenarios that will highlight the impact of
the proposed development.
1 Figure 13 shows the LOS operational results analysis for the short-term (2010) background volumes.
Figure 14 shows the LOS operational results for the short4c m trial volumes_ The wodmheds far this
analysis, including delays and capacities are provided in Appendix E and F.
Figure 15 shows the LOS operational results analysis for the long-term (2025) background vohmres_
Figure 16 shows the LOS operational results for the total volumes_ The wodsheets for this
analysis, including delays and capacities are provided in Appendix G and H.
An acceptable level of service is considered to be an overall LOS D for signalized intersections and LOS E
on any approach leg or movement For a non —signalized m1crsectim is an urban environment between an
arterial and local road, a LOS F is considered normal.
All the intersections have an arterial component and operate at an acceptable level both with and without
the development m the 2010 and 2025 time horizon_
Figure 13 — 2010 Background LOS
noonlpn
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Sonic Drive -In at Tower Shoppes
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Figure 14 — 2010 Total LOS
noon/pm
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Figure 15 — 2025 Background LOS
noon/pm
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Sonic Drive-in at Tower Shoppes
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Figure 16 — 2025 Total LOS and Geometrics
noon/pm
Geometry
The existing geometrics were derailed in Figure 4. The same geometries were applied in the short-term
T time horizon —In.the•long-term Um horizon, Timberhm Road was assumed to be a six -lane fatality as
shown in the Master Street Plan. The geometries are shown in Figure 16 and are acceptable.
As the rema,. a i—n_g portions of the Tower Shoppes PUD develop, westbound right turning volumes at the
access along Horsetooth willcorrtmue to increase. Although not necessary to achieve good levels of
service, a future right turn deceleration lane may be appropriate.
5. MULTI -MODAL LEVEL OF SERVICE ANALYSIS
The proposed development is a Drive -In Restaurant development located in southwest Fort Collins. The
surrounding area is substantially developed and is in an area where multi -modal amenities for pedestrians
and bicycles abound_
pedestrian Level of Service Analysis
The study area for pedestrians is by definition destinations drat are within 1320 ft of the proposed
development. This area is shown on the map in Appendix I. Potential destinations include the High
School, the English Ranch residential development to the south, and the business / coanmmmial area to ft
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west. In addition, Linton Elementary School is included in the analysis as that is the closest elementary
school and is located within the English Ranch subdivsion.
The pedestrian LOS worksheet is provided in Appendix]. This area is considered a "school walk area"
due to its proximity to Fort Collins High School- The standard Level of Service is C for visual interest and
I B for all other factors. This level of service is satisfied for all categories. Direct, continuous and detached
sidewalks are available to all the destinations. The signalize intersection at Horsetooth and Timberline
includes pedestrian push buttons.
' Bicycle Level ofService Anal
The bicvicee Level of Service Analysis is also included in Appendix I. The existing signed and striped bike
' lanes along both Timberline and Horsetooth provide a LOS A in all categories_ This meets the level of
service standards for bicycles.
Transit Level of ServiceAnalms
There is not currently any transit service to this area of Fort Collins. However, the Multi -Modal Level of
Service Manual indicates a fixture 2015 Transit System that includes "high frequency transit" west along
Horsetooth and north/south along Timberline.
6. SPECIAL ANALYSIS AREAS
During the course of the scoping meeting for this Traffic Impact Study, one area of special analysis was
identified and is discussed below.
Pedestrian Pedestrian St�l at Horsetooth and Arcuc Fox
Horsetooth and Arctic Fox
The intersection of East Horsetooth Road
and Arctic Fox also serves as the main
entrance for student parking at Fort
Collins High School. During the morning
(am) peak hour, there are heavy turning
movements into the school access. Some
students residing in the English Ranch
subdivision walk or bike to school and
utilize an existing striped cross walk on
the west side of the intersection. See
Figure IT
The City of Fort Collins requested a
special analysis of this condition in the
am peak to determine whether a
pedestrian signal is warranted.
Figure 17 — Arctic Fox / Horsetooth Crosswalk Location
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' Sonic Drive -In at Tower Shoppes
Morning peak hour turning movement
counts were completed at the intersection. High School Access
' This included both vehicular and
pedestrian/bike movements. They are
shown in Figure 18.
1 The Manual of Uniform Traffic Control i
Devices details in Section 4C.05 the 214
warrant for pedestrian signals and in 681 �sn Horsetooth
Section 4C.06 the warrant for a school 10 ` ',,,— 2
crossing signal. The minimum standard
indicates that the need for a traffic control
' signal should be considered if there is a
minimum of 20 students during the peak
hour (am). This warrant is not met at this
location. Arctic Fox
Figure 18 - am peak hour vehicle /pedestrian
volumes at Arctic Fox /Horsetooth
7. CONCLUSIONS AND SUMMARY OF FINDINGS
This study identified, documented and addressed the transportation impacts of the proposed Sonic Drive -In
north east of the intersection of E. Horsetooth Road and S_ Timberline Road in south Fort Collins. The
following conclusions can be drawn from the study:
■ The Some Drive -In is feasible from a traffic engineering standpoint. At full buildout, there
will be 19 bays for vehicles. The project will generate approximately 1,5W vehicular trips
daily, including 215 during the noon hour and 90 in the pm peak hour. The am peak hour is
- — - ---nominal for the Sonic, and was not analyzed.
' The current operation at the key intersection of E. Horsetooth / S. Timberline as well as the
two existing restricted movement accesses is acceptable with existing control and geometry.
■ The background traffic is assumed to increase at an annual rate of 1.5% due to regional
growth.
■ The comparison of the traffic analysis between the background and total traffic in both the
short-term time horizon (2010) and dic.long-term time horizon (2025) shows minimal impact
due to the proposed development.
■ For the short-term time horizon, de existing geometry at the intersections will continue to
provide acceptable levels of service, both with regional growth and the addition of this project_
■ For the long-term time horizon, Timberline Road is assumed to be six -lane facility as shown in
the Master Street Plan. With this geometry, the intersection will continue to provide
acceptable levels of service, both with regional gtvwdn and the addition of this project.
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TABLE OF CONTENTS
Section Description Page
1 Introduction.................................................................................................................
Purpose and Process
2 Existing Conditions......................................................................................................
Locations and Surrounding Area — Land Use
Existing Roadway System
Existing Traffic Conditions
Existing Traffic Operations
Existing Pedestrian Facilities
Existing Bicycle Facilities
Existing Transit Facilities
3 Proposed Development.................................................................................................
Development Type, Size, and Timetable
Development Access
Development Trip Generation
Development Trip Distribution and Assignment
4 Future Traffic Volumes and Capacity Analysis.............................................................
Background Traffic Projections
Total Traffic Projections
Operational Analysis
Geometry
5 Multi -Modal Level of Service Analysis........................................................................
Pedestrian Level of Service Analysis
Bicycle Level of Service Analysis
Transit Level of Service Analysis
6 Special Analysis Areas..............•---......----...-•--•-......................-----............----......-.........
Pedestrian Signal at Horsetooth and Arctic Fox
7 Conclusions and Summary of Findings........................................................................
Appendix A: Base Assumption Form
Appendix B: Peak Hour Traffic Count Information
Appendix C: Trip Generation Information
Appendix D: Intersection Analysis Worksheets - Existing
Appendix E: intersection Analysis Worksheets — Short Term Background
Appendix F: Intersection Analysis Worksheets — Short Term Total
Appendix G: Intersection Analysis Worksheets — Long Term Background
Appendix H: Intersection Analysis Worksheets — Long Term Total
Appendix I: Pedestrian / Bicycle / Transit Level of Service Analysis
II
1
2
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Sonic Drive -In at Tower Shoppes
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' Although not needed to achieve good levels of service, in conning years as the remaining
portions of the Tower Shoppes PUD develop, consideration should be given to a westbound
right turn deceleration lane at the access along Horsetooth Road. A proportioned cost sharing
arrangement for the construction of the lane may be appropriate
-
Acceptable Levels of Service are achieved for pedestrians and bicycle based upon the n}eas"M
in the multi -nodal transportation guidelines. Transfort does not currently provide serviceto
the area.
■ And finally, as requested, an am peak hour study was completed to determine whether the
warrant for a pedestrian signal at Arctic Fox and Horsetooth is met. The warrant is not q}ot;
aqq ft peak time does not coincide with the peak traffic generation of the proposed Sonic'
Dlive4n.
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Although not needed to achieve good levels of service, in coming years as the remaining
portions of the Tower Shoppes PUD develop, consideration should be given to a westbound
right turn deceleration lane at the access along Horsetooth Road. A proportioned cost sharing
arrangement for the construction of the lane may be appropriate.
■ Acceptable Levels of Service are achieved for pedestrians and bicycle based upon the measures
in the multi -modal transportation guidelines. Transfort does not currently provide service to
the area '
And finally, as requested, an am peak hour study was Completed to determine whether the
warrant for a pedestrian signal at Arctic Fax and Horsetoo th is met. The warrant is not met,
and the peak time does not coincide with the peak traffic generation of the proposed Sonic
Drive -
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List of Tables Description Page
1 Level of Service Definition for Intersections.............................................................. 4
2 Trip Generation ........................................................................................................ 7
List of Figures
Description
Page
1
Vicinity Map............................................................................................................
1
2
Existing Roadways and Neighboring Land Uses ........................................................
2
3
Existing Peak Hour Traffic Turning Movement Volumes ..........................................
3
4
Existing Geometrics and Level of Service.................................................................
4
5
Site Plan..................................................................................................................
6
6
Inbound Site Generated Trip Distribution Percentages ...............................................
7
7
Outbound Site Generated Trip Distribution Percentages ............................................
8
8
Site Generated Trip Assignment................................................................................
8
9
2010 Background Volumes.......................................................................................
9
10
2025 Background Volumes.......................................................................................
10
11
2010 Total Volumes ....................................... .............. ......... ....... ..................
11
12
2025 Total Volumes..................................................................0......................--......
11
13
2010 Background LOS.............................................................................................
12
14
2010 Total LOS........................................ .......... ........................... ........... 0..............
13
15
2025 Background LOS......................................................................................0......
13
16
2025 Total LOS and Long -Term Geometrics..................... ....... :...............................
14
17
Arctic Fox / Horsetooth Crosswalk Locations...................................................4.......
15
18
AM Peak Hour Vehicles / Ped Volumes at Arctic Fox / Horsetoath ...........................
16
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Sonic Drive -In at Tower Shoppes
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1. INTRODUCTION
This document represents a transportation impact study for the proposed Sonic Drive -In development
located in the Tower Shoppes PUD north -cast of the intersection of E- Hon;etooth Road and S. Timberline
Road in south Fort Collins. See Figure I - Vicinity Map.
Purpose and Process
The purpose of this study is to address the existing and future capacity, geometric and control conditions of
the transportation system and then determine the impact (and mitigation measures if necessary) of the
traffic produced by the proposed development.
This was accomplished by first:
• Completing scoping information via
several phone calls and a meeting on
6/9/05 with City of Fort Collins
Traffic Engineer Eric Bracke to
identify the study area and required
analysis (scoping sheets included in
Appendix A),
■ collecting existing traffic data,
■ analyzing the performance of the
existing intersections,
■ projecting the existing volumes to the
short-term horizon year of 2010 and
the long-term horizon year of 2025,
■ analyzing the performance of the
street network with future traffic
volumes in place.
second portion of the study included
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■ determining the volumes of traffic
to be generated by the Figure 1- Vicinity Map
development,
■ adding these volumes to the background traffic identified above,
■ analyzing the intersections for site plus the background traffic,
■ comparing the function of the background analysis with the background + site analysis,
■ completing level of service evaluation of pedestrian, bicycle and transit modes, and
■ compiding a spacial study as requested during scoping for the need of a pedestrian signal at
Horsetooth and Arctic Fox.
The final step in the analysis is to identify impacts and specify required mitigation measures to
accommodate the transportation impacts due to the development.
Page 1 of 17
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I 2. EXISTING CONDITIONS
Sonic Drive -In at Tower Shoppes
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I Location and Surrounding Area - Land Use
The location of the Sonic Drive -In is in south Fort Collins close to the intersection of East Horsetooth Road
and South Timberline Road. See Figure I - Vicinity Map. The site is currently undeveloped and listed as
ILot 4 of the Tower Shoppes PUD, which includes an ocisting McDonalds retaurant on a neighboring pad -
The area is relatively flat (from a transportation perspective) and other area land uses include Fort Collins
I High School to the north and east, residential housing to the south, business/commercial to the west, and
Platte River Power Authority headquarters also to the west. There are other portions of the Tower Shoppes
PUD that remain undeveloped.
Figure 2 - Existing Roadways and Neighboring Land Uses
Existing Roadway System
The primary streets in the vicinity of the proposed development are South Timberline Road and East
Horsetooth Road, which fronts the development. The roadways are shown in Figure 2 and typically include
travel lanes, striped on -street bike lanes, curb and gutter, landscaped parkway and detached sidewalk_
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South Timberline Road is currently a four -lane asphalt roadway and classified as a Major Arterial. The
posted speed limit is 40 mph_ There are striped bike lanes and left turn auxiliary lanes on the north and
south -bound approach to the signalized mtenection at Horseooth.
East Horsetooth Road is a four —lane arterial also with a 40 mph speed limit. It contains two lanes in each
direction and numerous auxiliary turn lanes at the approach to the signalized intersection at Timberline.
There are striped bike lanes and an existing detached walk along the frontage of the proposed Sonic Drive -
In.
' Existing Accesses. There are two existing accesses to the Tower Shoppes PUD. There is one access 400
ft. north of the Horsetoothai ilwi ne intersection that accommodates a % movement (right in, right out,
i and left in) through the use of a center raised median. The other access is 550 ft. east of the
Horsetooth/Iimberline intersection with only a right -in, teat movement (restricted by a center raised
median). Horizontal alignments at both access are straight, and sight distance is not an issue.
' Existing Traffic Conditions
The analysis of existing conditions provides insight into how the existing sired network is configured and
how well it performs_ This m%rmation is useful in establishing baseline conditions.
Peak hour (noon and pm) turning movement volumes at Horseooth / Timberline (counts completed by City
staff in March 2005) and the existing access locations (May 2005) are shown in Figure 3. The additional
intersection of Horseooth / Arctic Fox was counted as requested during the noon peak to identify high
school traffic. Raw traffic data is provided in Appendix B.
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Figure 3 —
Existing Peak Hour Traffic Turning Movement Volumes
I_
(noon /pm fmn ng vo& Ws)
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Existing Traf is Operations
In order to determine the function of the intersection in the study area, a level of service analysis was
completed. The analysis is based on procedures outlines in the Highway Capacity Manual (HCM 2000)
published by the Transportation Research Board (TRB). This type of analysis assigns a letter value based
on average delay experienced by vehicles to indicate the level of service (LOS) of the intersection. The
letter values assigned range from A to F with A being the best A summary and definition of each LOS
letter designation is provided in Table 1 for bath unsoialiaed and signalized ink.
Tahle I — T.evel nfSCervice nefinitian for Intersections
Unsignalized Intersection
Signalized Intersection
LOS
Average Delay (seelveh)
A
<-10.0
_4M.0
B
>10.0 and —<15.0
>10.0 and -<20.0
C
>15.0 and _<25.0
>20.0 and !�35.0
D
>25.0 and �35.0
>35.0 and 555.0
E
>35.0 and <_50.0
>55.0 and 580.0
F
>50
>80
Source: HighwaycapacityManua{ Irmmsportationtterearchnoarq [uao
/fluff`
DID J `DID
DID � DID ,
`DID
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Int. LOS C / D
Figure 4 — Existing Geometrics and Level of Service
(noon)"pm)
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Using the peak hour traffic shown in Figure 3, the peak hour operation based upon the existing geometrics
is shown in Figure 4. Analysis sheets are included in Appendix D.
The key intersections operate acceptably overall duriig both the noon and aftemoon peak hours_
Eristiny Pedestrian Facilities
As can be seen in Figure 2, there is a comprehensive network of pedestrian facilities in the vicinity of the
proposed development_ The vast majority of the sidewalks are detached walls. Along the frontage of the
proposed development, there is an existing detached sidewalk.
Existing &Lwle Facilities
Bicycle lanes are striped (and signed) along both East Horsetooth and South Timberline Roads. Where
exclusive right turn lanes are present, the bike lanes are skip -striped through the taper.
Existing Transit Facilities
Transfort, the City's transit service does not provide regular service to this area of Fort Collins. The
closest bus route is Route #5 that operates along Lemay Avenue one mile to the west.
3. PROPOSED DEVELOPMENT
Development Type. Size and Timetable
The proposed Sonic is a "drive-in" restaurant with 19 parking bays. There is no drive4hrough_ For
customers that prefer to eat outside tieir cars, there will be limited indoor and outdoor seating
The timetable identified by the developer is for construction to begin during 2005, with full buildout
anticipated within the next year. Per the Larimer County Urban Area Street Standards, the short-range
_—time horizon used in the analysis is 2010, and the long-range time honzm is 2025_
A conceptual layout of the site plan is shown in Figure 5 on the following page.
Development Access
The access of the proposed development to the adjacent arterials will be via existing roadways and two
existing access locations. See Figure 2. The access to South Timberline is a % access and the access to
Horsetooth is limited to a right -in, right -out movement. The existing accesses already provide access to the
existing McDonald retaurant just to the west, and will in the fixture provide access to other additional
developments and lots within the PUD_
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Figure 5 - Site Plan
Development Trip Generation
Sonic Drive-in at Tower Shoppes
•00
In order to determine how many trips the proposed development will likely generate during the identified
peak hours, the proposed trip generation characteristics were identified. This process is typically
conducted using the histitute of Transportation Engineers (TTE) Trip Generation Manual, 7d'Edition.
However, the TTE manual does not include a land use similar to a drive-in restaurant_ Therefore, as
approved in the scoping meeting, peak how noon and pm entering and exiting traffic at the existing Sonic
Drive -In along West Elizabeth street was counted (raw data prowled in Appendix Q. Then the size of the
restaurant was compared and prorated to accommodate the higher number of bays proposed for this
restaurant.
With the proposed restaurant so close to the high school (and across the street from residential homes),
some patrons are expected to walk, and therefore a 10% mode split reduction is mcluded. In addition,
1 o% pass -by percentage reflects time patrons who would have been utilizing the adjacent roadways
without the development Pam.
Trip generation is summarized in Table 2. Details are included in Appendix C.
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