HomeMy WebLinkAbout4.D.2. Approve Traffic Control Change for 13th Avenue and Polk Street y . o. a .
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Memorandum
TO: Mayor& City Council
Mark McNeill, City Administrator
FROM: Bruce Loney, Public Works Director
SUBJECT: Approve Traffic Control for 13th Avenue and Polk Street
DATE: August 21, 2012
ACTION SOUGHT:
For Council to approve a motion approving stop signs on Polk Street at the intersection of Polk
Street and 13r�' Avenue.
INTRODUCTION:
At the August 6, 2012 Traffic Safety Review Committee, the committee reviewed a traffic study
and is recommending to install stop signs on Polk Street with the intersection of 13�" Avenue.
BACKGROUND:
A traffic study has been done by engineering staff for the intersection of Polk Street and 13�n
Avenue due to the number of accidents the past two years. The traffic study did indicate a
number of accidents have occurred that could be eliminated with the installation of stop signs.
The major street volume is 13t�' Avenue, and these stop signs would be placed on Polk Street.
Other major factors beside the high number of accidents, are the sight distance issues with pine
trees, street grades and parked cars near the intersection.
ALTERNATIVES:
1. Approve a motion directing staff to install stop signs on Polk Street with this intersection
of 13t" Avenue.
2. Do not approve a motion to install stop signs.
3. Table for additional information and/or further study.
RECOMMENDATION:
The Traffic Safety Review Committee recommends Alternative No. 1.
RELATIONSHIP TO VISIONING:
This supports Goal E: "Deliver effective and efficient public services by a staff of well-trained,
caring, and professional employees".
ACTION REQUESTED:
Approve a motion directing staff to install stop signs on Polk Street with this intersection of 13`n
Avenue.
Bruce Loney, P.
Public Works Director
ENGR^_01'PROIECTS�COCVCIL.4pproveTrafficControlforl3thandPolk
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� Polk & 13th °"'� �°^°. 13, 2012 DRAWtNG No.
�� Traffic Study coua,s ar: �MS A I
m�pnrlosp� SHAKOPEE ENGINEERING DEPARTIAENT i
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Does the Intersection of Polk St & 13`" Ave
Meet the Warrant for a Two-Way Stop Sign?
A stop sign is warranted if two of the followin� four conditions exist:
(Conditions are from the Shakopee Signin�Manual, January 19, 2010)
1.) If the major street traffic volume approaching the intersection for each leg adds
up to more than 1,000 vehicles per day and the minor street traffic volume is less
than 50% of the major street traffic volume(�00 —7�0 vehicles per day).
13`" Ave has an ADT total for both le�s of 433 and Polk St has an ADT total for both
le�s of 299. This intersection does not meet the traffic volume requirement.
2.) There have been more than two reported crashes, per year in the previous two
years or, three reported crashes in the previous year of a type correctable with
stop sign installation.
The intersection of Polk St & 13`" Ave had three(3) reported accidents in 2010 and
two (2) reported accidents in 2011. The intersection does meet the accident
requirement.
3.) The pedestrian volumes across the minor approach(that which would be
stopping) is more than 1� pedestrians per hour during the peak traffic hours.
Pedestrian volumes were not counted.
4.) If the safe stopping sight distance of the minor approach is restricted by less
than 100 feet by horizontal and/or vertical roadway alignment or by other
permanent obstructions (see�gure).
Approach restrictions are greater than 100 feet. As policy states all sight triangles are
fi•ee of obstruction. The intersection does not meet the sight distance requirement.
However, several sight distance concerns do exist due to location of a pine tree,
parked cars and a incline on the south approach.
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Does the Intersection of Polk St & 13`� Ave
Meet the `Varrant for an All `Vay Stop?
A stop si�n is warranted if three of the following five conditions exist:
(Conditions are fi•om the Shakopee Si�ning Manual, Januaiy 19,2010)
1.) If the major street traffic volume approaching the intersection for each leg adds
up to more than 1,500 vehictes per day and the minor street traf�c volume
approaches the intersection for each leg adds up to be greater than 7�0 vehicles
per day.
13`� Ave has an ADT of 433 and Polk St has an ADT of 299. This intersection does
not meet the traffic volume requirement.
2.) There have been more than two reported crashes, per year in the previous two
years or, three reported crashes in the previous year of a type correctable with
stop sign installation.
The intersection of Polk St & 13`� Ave had three(3) reported accidents in 2010 and
two (2) reported accidents in 2011. The intersection does meet the accident
requirement.
3.) If the pedestrian volumes crossing any approach is more than 15 pedestrians per
hour during the peak traffic hours.
Pedestrian volumes were not counted.
4.) If the safe stopping distance on the uncontrolled approach is restricted by less
than 100 feet by horizontal and/or vertical roadway atignment or by other
permanent obstructions.
Approach restrictions are greater than 100 feet. As policy states all sight triangles are
free of obstiuction. The intersection does not meet the sight distance requirement.
However, several sight distance concerns do exist due to location of a pine tree,
parked cars and a incline on the south approach.
�.) If the 85`h percentile speed in the intersection is greater than 35 mph and the
highest reported speed with two or more observations is greater than 45 mph.
No speed test where performed at the intersection of Polk St & 13`h Ave.