Agenda 04/11/2017 Item #10B 10 B
Proposed Agenda Changes
Board of County Commissioners Meeting
April 11, 2017
Add On Item 10B: Recommendation to accept a Multi-Way Stop
Warrant Study and approve the installation and operation of a 4-
way stop control at the intersection of St. Andrews Boulevard and
Wildflower Way at an installation cost of approximately $300, with
an annual maintenance cost of approximately $100 (Cost Center
163630). (Commissioner Fiala's request)
Move Item 16A8 to Item 11B: Recommendation to approve a Resolution amending Ordinance No.
2004-66,as amended,that created an administrative code for Collier County,to amend Exhibit
"B,"Administrative Code for Land Development,by amending Chapter Four,Administrative
Procedures,more specifically to add section M,Stormwater Plan; amending Chapter Eight,
Public Notice,more specifically to amend section F,Stakeholder Outreach Meeting for Golf
Course Conversion(SOM); and providing an effective date. (This is a companion to Agenda Item
9.B.) (Commissioner Solis' request)
Time Certain Items:
Item 13A to be heard at 10:00 a.m.
Item 10A to be heard at 1:00 p.m.
Item 12A to be heard immediately following Item 5B
4/18/2017 3:30 PM
Add On Item 10B
April 11, 2017
EXECUTIVE SUMMARY
Recommendation to accept a Multi-Way Stop Warrant Study and approve the installation
and operation of a 4-way stop control at the intersection of St. Andrews Boulevard and
Wildflower Way at an installation cost of approximately $300, with an annual maintenance
cost of approximately $100 (Cost Center 163630).
OBJECTIVE: To request the Board of County Commissioners (“Board”) accept a Multi-Way
Stop Warrant Study and approve construction, activation and maintenance of a 4-way stop
control at the intersection of St. Andrews Boulevard and Wildflower Way in accordance with
any and all applicable federal, state, and county standards and specifications governing such
traffic control devices.
CONSIDERATIONS: Florida Statute §316.006 provides that the County “may place and
maintain such traffic control devices which conform to the manual and specifications of the
Department of Transportation upon all streets and highways under its original jurisdiction as it
shall deem necessary…to regulate, warn or guide traffic.” A traffic engineering study,
performed and approved by a Professional Engineer registered to practice in the State of Florida,
has concluded with the determination that the subject intersection meets the minimum warrants
for a multi-way stop, as set forth in the Manual on Uniform Traffic Control Devices (MUTCD).
Installation of a 4-way stop at this location is within Collier County Access Management
Guidelines.
The traffic engineering study was performed at the request of the Lely Country Club Property
Owner’s Association. The study report was completed March 31, 2016, in accordance with
guidelines promulgated by the Florida Department of Transportation and the MUTCD. The
investigation of the need for a multi-way stop includes an analysis of various factors related to
the operation and safety of the intersection and determines if specific warrants identified within
the MUTCD are met.
FISCAL IMPACT: We estimate the cost of this work to be $300, with an annual maintenance
cost of approximately $100. Funds are available in Traffic Operations General Fund 101.
GROWTH MANAGEMENT IMPACT: There is no Growth Management Impact associated
with this Executive Summary.
LEGAL CONSIDERATIONS: This item is approved as to form and legality, and requires
majority vote for Board approval.—SRT
RECOMMENDATION: That the Board accepts the recommendations of the Multi-Way Stop
Warrant Study and approve construction, activation and maintenance of a 4-way stop control at
the intersection of St. Andrews Boulevard and Wildflower Way in accordance with any and all
applicable federal, state, and county standards and specifications governing such traffic control
devices.
Prepared by: Daniel G. Hall, PE, Principal Project Manager, Growth Management Department
Location Map
St Andrews Blvd. at Wildflower Way
St Andrews Blvd Wildflower Way
Study Intersection
St Andrews Boulevard at Wildflower Way
Multi -Way Stop Analysis
Prepared for:
Lely CCPOA
Authorized by:
Collier County Growth Management Department
Traffic Operations Section
Prepared by:
Daniel G. Hall, P.E.
Senior Project Manager
Registration No: 58050
Signature:
Date L( i `I ` /
March 31, :016
Multi -Way Stop Intersection Study Report
St Andrews Boulevard
At
Wildflower Way
Co*er County
Prepared By:
Daniel G. Hall, P.E.
GROWTH MANAGEMENT DIVISION
COLLIER COUNTY, FLORIDA
March 31, 2016
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The MUTCD, published by the U.S. Department of Transportation is the national standard for traffic
control devices. The Florida Department of Transportation has adopted the MUTCD as the State
standard and it governs the placement and design of traffic signals, signs, and pavement markings on
public and private roads within the state.
MUTCD Warrants for Multi -Way Stop Signs:
The MUTCD states the following support statements for the use of multi -way Stops: "Multi -way stop
control can be useful as a safety measure at intersections if certain traffic conditions exist. Safety
concerns associated with multi -way stops include pedestrians, bicyclists, and all road users expecting
other road users to stop. Multi -way stop control is used where the volume of traffic on the intersecting
roads is approximately equal"
The MUTCD provides the following guidance statements:
The following criteria should be considered in the engineering study for a multi -way Stop sign
installation:
3
A. Where traffic control signals are justified, the multi -way stop is an interim measure that can be
installed quickly to control traffic while arrangements are being made for the installation of the
traffic control signal.
B. A crash problem, as indicated by 5 or more reported crashes in a 12 -month period that are
susceptible to correction by a multi -way stop installation. Such crashes include right -and left -
turn collisions as well as right-angle collisions.
C. Minimum volumes:
1. The vehicular volumes entering the major street approaches (total of both approaches)
averages at least 300 vehicles per hour (vph) for any 8 hours of an average day, and
2. The combined vehicular, pedestrian, and bicycle volume entering the intersection from the
minor street approaches (total of both approaches) average at least 200 units per hour for the
same 8 hours, with an average delay to minor -street vehicular traffic of at least 30 seconds
per vehicle during the highest hour, but
3. If the 85 -percentile approach speed of the major -street traffic exceeds 40 mph, the minimum
volume warrant is 70% of the above values.
When the 85 percentile speed exceeds 40 mph, the traffic volumes on the major street should be
at least 210 vehicles per hour for any 8 hours and the traffic volumes on the minor street should
be at least 140 vehicles per hourfor the same 8 hours.
D. Where no single criterion is satisfied, but where Criteria B, C.1, and C.2 are all satisfied to 80%
of the minimum values, Criteria C.3 is excluded from this condition.
STUDY DETAILS
Existing Road Characteristics
St Andrews Boulevard is a two-lane, median separated urban roadway with a gore separated bike lane
on both sides of the road and Wildflower Way is a two-lane urban roadway. St Andrews Boulevard is
functionally classified as a collector roadway and Wildflower Way is functionally classified as a local
road. Traffic volumes from Lely Ct were not considered as part of this study due to the minimal volume
from this cul-de-sac. This intersection is within the Lely neighborhood south of Rattlesnake Hammock
Road. The posted speed limit on St Andrews Boulevard is 30 mph and the posted speed limit on
Wildflower Way is 35 mph.
Traffic Volume Warrant
A 24-hour traffic volume count was performed on March 23, 2016. The data collected includes traffic
approaching from three directions at the intersection. The information with the highest hourly traffic
volume has been abstracted in the following (Figures 3 and 4):
The warrant for vehicular volumes for both St Andrews Boulevard and Wildflower Way are met for the
same eight hours. Multi way stop control is to be used where the volume of traffic on the intersecting
roads is approximately equal. Therefore; Vehicular volume warrant was met at this intersection.
11
St Andrews Boulevard Vehicles Per Hour (VPH) — Major Street (Min. 300)
Interval (Hours)
Both
Approaches
North Bound
South Bound
6:00-7:00
AM
269
166
103
7:00-8:00
AM
656
353
303
8:00-9:00
AM
461
238
223
9:00 -10:00
AM
363
194
169
10:00 -
11:00 AM
412
193
219
11:00 -12:00
AM
381
198
183
12:00
-1:00 PM
421
214
207
1:00
- 2:00 PM
461
237
224
2:00
- 3:00 PM
520
268
252
3:00
- 4:00 PM
514
264
250
4:00
- 5:00 PM
583
290
293
5:00
- 6:00 PM
623
288
335
6:00
- 7:00 PM
557
268
289
7:00
- 8:00 PM
467
250
217
8:00
- 9:00 PM
407
239
168
9:00 -10:00
PM
348
162
186
Figure 3
Intersection Approach Volumes, St Andrews Boulevard
Wildflower Wav Vehicles Per Hour (VPH) = Minor Street (Min. 200)
Interval (Hours)
Both
Approaches
East Bound
West Bound
6:00 —
7:00 AM
90
59
31
7:00 —
8:00 AM
290
174
116
8:00 —
9:00 AM
170
70
100
9:00 —10:00
AM
157
48
109
10:00 -11:00
AM
180
86
94
11:00 -12:00
AM
207
74
133
12:00
-1:00 PM
236
98
138
1:00
- 2:00 PM
231
123
108
2:00
- 3:00 PM
392
158
234
3:00
- 4:00 PM
223
102
121
4:00
- 5:00 PM
218
100
118
5:00
- 6:00 PM
244
124
120
6:00-7:00
PM
198
88
110
7:00
- 8:00 PM
129
63
66
8:00
- 9:00 PM
114
75
39
9:00 -10:00
PM
97
64
33
Figure 4
Intersection Approach Volumes, Wildflower Way
Field Observations
On March 31, 2016, photos were taken during the hours of 11:30 AM to 12:00 PM at the subject
intersection. Photographs of the study intersection are provided below:
Photo 1— St Andrews Boulevard looking south
Photo 2 — St Andrews Boulevard, looking north
G
Photo 3 — Wildflower Way looking west toward St Andrews Boulevard
Photo 4 — Lely Court looking cast toward St Andrews Boulevard
7
b
4
Photo 3 — Wildflower Way looking west toward St Andrews Boulevard
Photo 4 — Lely Court looking cast toward St Andrews Boulevard
7
Crash History Warrant
The intersection crash history was reviewed from 2013 to present (Appendix B). During this three year
period, there were six recorded crashes near the intersection. To meet the crash warrant for a multi -way
stop, the MUTCD requires 5 or more crashes in a 12 -month period that are susceptible to correction by a
multi -way stop application. In 2015, there was one right angle crash that was susceptible to correction
by a multi -way stop application. The crash history of this intersection did not meet the warrant for
a multi -way stop sign installation.
Intersection Sight Distance
The Traffic Engineering Handbook identifies that motorists approaching intersections should have a
sufficient, unobstructed view of the intersection and approaches. The American Association of State
Highway and Transportation Officials (AASHTO) provide standards and guidelines regarding
intersection sight distance. The AASHTO model for sight distance (Figure 5) provides a method to
determine the sight distance available for a given intersection. For this location, using Case B 1 -Left turn
from the minor road, letter "a" is recommended as a distance from 14.4' to 17.8' (I used a safe stopping
distance of a=14.5') and letter "b" uses the formula (ISD = 1.47V,»aj,tg) or ISD = 1.47*35*7.5=386',
where Vmajor is the design speed of the major road and tgis the time gap taken for a passenger car from
Exhibit 9-54. Therefore, letters "a" and "b" would be approximately a= 14.5' and b= 386', respectively.
An engineering field review has shown that the study intersection does provide adequate sight distance
for the turn movements. At this intersection, drivers are to stop at the stop bar/stop sign on Wildflower
Way and Lely Court before entering the intersection. There are no significant safety issues regarding
sight distances at the intersection or approaches to the intersection. A row of hedges is on the northwest
coiner of Lely Court and will need to be maintained properly to keep adequate sight distance. Warrant
requirement for intersection sight distance (Option) is not met.
��� MajerRoad Maj9rttaad
8 ;
T Clear Sight Trinngie
Decision Point
Clear Sight Triangie for Viewing
TYaffic Approaching from the Right
clear Sight Trlangte
Decision Paint
Clear Sight Triangle for Viewing
Traffic Approaching from the Left
b Fs
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Figure 5, AASHTO Model for Intersection Sight Distance
CONCLUSION & RECOMMENDATION
Based on the traffic volume review, it is determined that the subject intersection does meet MUTCD
requirements for multi -way stop control. St Andrews Boulevard and Wildflower Way traffic
operational characteristics and safety could be improved by multi -way stop control. Therefore, it is
recommended that the intersection of St Andrews Boulevard and Wildflower Way be changed to multi -
way stop controlled and that stop signs be installed on the St Andrews Boulevard at both approaches to
Wildflower Way.
9
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APPENDIX B
Crash History
14
Collier County Collision Diagram
SAINT ANDREWS BLVD @ WILDFLOWER WAY
Total Crashes:6 Date: 01101/2013 - 03/0112016 Total Diagrammed: 6
r
RUN
OFF
ROAD
HR
flied
Object
Legend
- 1
23
45
- 6-10
>10
Total Fatalities: 0
Total Injuries: 2
Total Motorcycle
Crashes: 0
Prepared by:
DAN HALL
0312WO16
15