HomeMy WebLinkAbout02-352 attach.docTO:
FROM:
DATE:
RE:
MEMORANDUM
Richard Wollangk, City Manager
Q/HKO/H
ON THE WATER
Mark Huddleston, Transportation Director
September 18, 2002
Item Defeated by the Traffic Review Board at their September 10, 2002 Meeting
REQUEST FOR A 25 MPH SPEED LIMIT ON KOELLER STREET FROM 20TM AVENUE
TO HIGHWAY 44. [EXISTING CONDITION: 30 MPH SPEED LIMIT].
This is a request from a Boardmember.
The City Transportation Department conducted a speed survey on Koeller Street between 20th
Avenue and Highway 44 during August, 2002. The results are summarized below:
SPEED SURVEY
KOELLER STREET BETWEEN 20TM AVENUE AND HIGHWAY 44
AUGUST 2002
Direction Average Speed
85th Percentile Daily Traffic Volume
Northbound 33.0 38.2 3,954
Southbound 28.6 34.1 4,506
The posted speed limit is 30 mph. The 85th percentile speed for southbound traffic is 34.1 mph.
The 85th percentile speed is normally used to establish speed limits. It is assumed that 85% of all
drivers will drive at a speed that is reasonable and prudent. In short, the 85th percentile speed is
the collective judgement of what drivers feel is a safe speed. ! would normally reduce the 85th
percentile speed by 5 mph to 7 mph due to enforcement issues to determine an appropriate
speed. This method would indicate that a 25 mph speed limit would be appropriate for this
section of Koeller Street.
The traffic counts were taken on a Monday and higher volumes could be expected on weekends
with the amount of retail businesses in the area. The higher traffic volumes would tend to lower
the average speed limit because of increased turning movements. ! did a quick review of
accidents on this section of Koeller Street and compared it with the area north of20th Avenue.
There were eight (8) accidents south of 20th Avenue and ten (10) accidents north of 20th Avenue.
The accident rates appear to be fairly typical for this type of roadway.
DEFEATED BY TRAFFIC REVIEW BOARD (1 - 6)