HomeMy WebLinkAboutTraffic Control Device - New Installation - (2) Stop Signs - Lafayette Blvd. & Madison St.October 24, 2023
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CITY OF SOUTH BEND
DEPARTMENT OF PUBLIC WORKS DIVISION OF ENGINEERING
TO: Board of Public Works
THROUGH: Kara Boyles, Ph.D, P.E., City Engineer
FROM: Chana Roschyk, Project Engineer
SUBJECT: Lafayette and Madison Multi-Way Stop Warrant Analysis (TR23-060)
DATE: September 25,2023
Purpose
The purpose of this study is to
determine whether any traffic control
improvements are warranted at the
intersection of Lafayette Boulevard and
Madison Street. The Engineering
Division internally generated a concern
based on a development at the
intersection. This memo summarizes
the warrant analysis conducted to
assess the need for a permanent all-
way stop at this intersection and the
proposed recommendation.
Location/Description
Both Lafayette Blvd. and
Madison St. are classified as local roads with one travel lane per direction. This
intersection is located in an area zoned “Downtown”. Adjacent to the intersection in the
northwest direction, there is zoning for “residential urban neighborhood”. At the
northwest corner of the intersection, there is a new building (Portage School of Leaders)
which is currently under construction. Commercial buildings are present at the
southwest corner. Parking lots are located at the southeast and Northwest corners of
the intersection.
Warrants
The Manual on Uniform Traffic Control Devices sets forth the following
requirements to warrant the installation of multi-way stop control:
The following criteria should be considered in the engineering study for a multi-way STOP sign
installation:
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. Five or more reported crashes in a 12-month period that are susceptible to correction by a multi-
way stop installation. Such crashes include right-turn and left-turn collisions as well as right-
angle collisions.
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C. Minimum volumes:
1. The vehicular volume entering the intersection from the major street approaches (total of both
approaches) averages at least 300 vehicles per hour 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) averages 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 85th-percentile approach speed of the major-street traffic exceeds 40 mph, the minimum
vehicular volume warrants are 70 percent of the values provided in Items 1 and 2.
D. Where no single criterion is satisfied, but where Criteria B, C.1, and C.2 are all satisfied to 80
percent of the minimum values. Criterion C.3 is excluded from this condition.
Existing Traffic Controls This intersection is currently controlled by a two-way stop where Madison St. stops in both
directions and Lafayette Blvd. is the through street.
Northbound traffic on Lafayette Blvd. continues 500 ft. before reaching an intersection with
Marion St. which is controlled by an all-way stop. Southbound traffic on Lafayette Blvd. continues 300 ft. before reaching an intersection with LaSalle Av. which is a signalized intersection.
Eastbound traffic on W Madison St. continues 430 ft. before reaching an intersection with
Main St which is controlled by a two-way stop where traffic on Madison stops, and Main St. is the
through street. Westbound traffic on W Madison continues 415 ft. before reaching an intersection
with N William St. which is which is a signalized intersection.
Street Geometry Lafayette Blvd is a 42 ft. wide roadway on the north and south side of the intersection. On both approaches, parking is restricted on both sides of the street. Madison St is a 42 ft. wide
roadway to the east and west of the intersection. Parking is unrestricted on Madison St. on both sides of the street.
Traffic & Pedestrian Counts
Traffic counts were taken by MACOG on July 25, 2023, by traffic recording cameras at
each approach of this intersection and the following are the results:
Date Time
N Lafayette
Blvd.
Vehicles
Only
Northbound
N Lafayette
Blvd.
Vehicles
Only
Southbound
W Madison
St.
Vehicles
Only
Westbound
W Madison
St.
Vehicles
Only
Eastbound
Total of N
Lafayette
Blvd.
Vehicle
Approaches
Total of W
Madison St.
Vehicle
Approaches
7/25/2023 12:00 AM 30 28 13 12 58 25
1:00 AM 22 20 11 10 42 21
2:00 AM 18 16 5 4 34 9
3:00 AM 13 7 2 6 20 8
4:00 AM 14 7 5 1 21 6
5:00 AM 16 11 3 2 27 5
6:00 AM 40 28 8 7 68 15
7:00 AM 133 59 18 13 192 31
8:00 AM 183 146 21 29 329 50
9:00 AM 152 151 26 27 303 53
10:00 AM 150 140 24 33 290 57
11:00 AM 152 118 31 26 270 57
12:00 PM 180 126 41 21 306 62
1:00 PM 210 146 45 33 356 78
2:00 PM 164 152 34 29 316 63
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3:00 PM 200 170 44 28 370 72
4:00 PM 209 219 47 39 428 86
5:00 PM 252 185 48 36 437 84
6:00 PM 223 168 42 28 391 70
7:00 PM 139 97 21 24 236 45
8:00 PM 120 95 17 21 215 38
9:00 PM 90 67 21 24 157 45
10:00 PM 89 53 24 17 142 41
11:00 PM 72 33 15 13 105 28
Total 2871 2242 566 483 5113 1049
The cells highlighted in green show the eight hours of the day with the highest traffic
counts on the major street approaches. The cells highlighted in blue show the traffic on the
minor street for the same eight hours of the day.
Additionally, pedestrian counts were taken by MACOG on July 25, 2023, by traffic
recording cameras at each approach of this intersection and the following are the results:
Date Time
N
Lafayette
Blvd
Northboun
d Peds
Lafayette
Blvd
Southboun
d Peds
W.
Madison
Westboun
d Peds
W.
Madison
Eastbound
Peds
Total of NS
(Major)
Street
Peds
Total of
EW
(Minor)
Street
Peds
11/22/2022 12:00 AM 0 2 1 6 2 7
1:00 AM 1 0 5 2 1 7
2:00 AM 0 0 0 1 0 1
3:00 AM 0 2 0 2 2 2
4:00 AM 0 0 2 1 0 3
5:00 AM 0 0 3 1 0 4
6:00 AM 0 0 0 2 0 2
7:00 AM 0 1 1 1 1 2
8:00 AM 1 0 3 0 1 3
9:00 AM 1 3 3 5 4 8
10:00 AM 0 4 1 6 4 7
11:00 AM 7 2 5 6 9 11
12:00 PM 2 1 6 5 3 11
1:00 PM 0 0 5 9 0 14
2:00 PM 0 3 2 6 3 8
3:00 PM 0 1 4 7 1 11
4:00 PM 1 3 3 9 4 12
5:00 PM 0 0 4 2 0 6
6:00 PM 0 3 6 4 3 10
7:00 PM 1 0 1 6 1 7
8:00 PM 0 5 3 5 5 8
9:00 PM 0 0 4 1 0 5
10:00 PM 2 1 7 4 3 11
11:00 PM 0 0 1 5 0 6
Total 16 31 70 96 47 166
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The cells highlighted in green show the eight hours of the day with the highest
pedestrian counts on the major street approaches. The cells highlighted in blue show the
pedestrian count on the minor street for the same eight hours of the day.
Collision Data
Five years of collision records were accessed, the greatest three years of volume were
analyzed. In the Aries portal (January 1, 2018 – December 31, 2022). Fourteen incidents
occurred at this intersection in this three-year period; more specifically, there were four (4)
incidents in 2019, five (5) incidents in 2020, and five (5) incidents in 2021. Based upon primary
factors or narrative listed in the police report, eleven (11) of these incidents were right-angle
collisions. This data meets the threshold for a multi-way stop warrant, which is a minimum of
four (4) right-angle collisions in a 12-month period.
Other Considerations
Optional criteria for an all-way stop
include the need to control left turn conflicts,
high pedestrian volumes and
vehicle/pedestrian conflicts, visibility conflicts,
and two similar residential neighborhood
streets.
There is an addition of a school,
Portage School of Leaders, which is currently
under construction. This school is located at
the northwest corner of the intersection of N
Lasalle Blvd and W Madison St. Given this,
vehicular, pedestrian and bicycle traffic are
anticipated to increase. The picture to the
right is taken from the stop sign for the
northbound travel lane on N Lafayette Blvd at
the southeast corner of the intersection.
Recommendation
Collision data warrants a multi-way stop, as does major street approach traffic volume.
There are additional considerations that impact the safety of this intersection. Additionally, with
the new Portage School of Leaders school, pedestrian traffic through this intersection is
encouraged and should increase. Given the collisions and expected pedestrian traffic increase,
the Engineering Division recommends adding stop signs on N Lafayette Blvd. at the intersection
with W Madison St. to make the intersection an all-way stop.
BOARD OF PUBLIC WORKS
AGENDA ITEM REVIEW REQUEST FORM
Date: 10/3/2023
Name: Chana Roschyk Department of Public Works – Engineering Division
BPW Date: 10/24/23 Phone Extension: 5922
Required Prior to Submittal to Board BPW Attorney X Attorney Name
Dept. Attorney Attorney Name
Purchasing
Check the Appropriate Item Type – Required for All Submissions
Professional Services Agreement Contract Proposal
Open Market Contract Amendment/Addendum Special Purchase, QPA
Bid Opening Bid Award Req. to Advertise Title Sheet
Quote Opening Quote Award Reject Bids/Quotes
Proposal Opening C/O & PCA No. PCA
Chg. Order, No. Traffic Control Resolution
Other: Ease./Encroach
Required Information
Company or Vendor Name
New Vendor Yes If Yes, Approved by Purchasing
No
MBE/WBE Contractor MBE
WBE Completed E-Verify Form Attached Yes
No
Project Name Madison and Lafayette 4-Way Stop Study
Project Number TR-23-060
Funding Source NA
Account No. PR/PO # NA
Amount NA
Terms of Contract NA
Special Contract Provisions NA
Purpose/Description See attached memo for multi-way stop warrant analysis and design for sign
placements.
For Change Orders Only
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Current Percent of Change:
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New Completion Date: