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HomeMy WebLinkAboutCC 6 SPEED ZONES SURVEY 5-16-88, i~ NO. 6 TO: FROM: SUBJECT: WILLIAM HUSTON, CITY MANAGER PUBLIC WORKS DEPARTMENT/ENGINEERING DIVISION ENGINEERING AND TRAFFIC SURVEY FOR SPEED ZONES .j RECOM}{ENDATION: That the City Council approve the Engineering and Traffic Survey dated April 12, 1988 as prepared by Dennis Barnes, Consulting Traffic Engineer of BSI Consultants, Inc. BACKGROUND: Section 40802 of the Vehicle Code provides that an engineering and traffic survey must be prepared to justify speed limits. The survey must be done every five years or radar cannot be used for enforcement. BSI Consultants, Inc., the City's traffic-engineering consultant, has prepared the survey, a copy of which is attached. The Police Department Traffic Section has reviewed the study and concurs with its recommendations. Each year a portion of the City's arterial streets are surveyed so that all will be covered during a 5-year period. The streets studied this year are those that we last surveyed in 1983. They include Main Street from west city limit to Bryan Avenue and Bryan Avenue from Main street to Browning Avenue. Six segments of Main Street and three segments of Bryan Avenue were studied. The existing speed limit on all segments of both streets is 40 MPH except Main Street from "B" Street to Prospect Avenue is 30 MPH. The survey shows that these speed zones are proper and should be maintained. No action of the City Council is needed other than to approve the engineering and traffic survey report prepared by Dennis Barnes of BSI Consultants, Inc. dated April 12, 1988. Bob Ledendecker Director of Public Works/City Engineer Ro~nald~E ~ rd Manager Engineer~ng~ BL:REW:mv Attach. j CONSULTANTS, INC Consultants to Governmental Agencies April 12, 1988 City of Tustin Attention Mr. Bob Ledendecker Director of Public Works 300 Centennial Way Tustin, California 92680 Engineering and Traffic Survey for Nine (9) Street Segments Within the City of Tustin As..requested, engineering and traffic surveys have been completed for several routes in the city of Tustin. Therefore, I am pleased to submit this letter-type report which contains recommendations for posted prima facie speed limits on the 9 street segments surveyed. The California Vehicle Code requi_res that engineering and traffic surveys be conducted every five years to enable the continued use of radar for speed~. enforcement. These engineering and traffic surveys include measurements of prevailing speeds, an analysis of accident records, and a review of highway, traffic and roadside characteristics which are not apparent to motorists. However, in accordance with California Vehicle Code provisions, local streets which are not included on the City's Federal Aid Urban (FAU) Select System of Streets are exempt from the survey requirements. Since the last engineering and traffic survey for the subje- ct streets was conducted during the month of April of 1983, a new survey has been conducted so that radar enforcement can continue. The individual surveys for each of the 9 street segments involved the following factors: 1. Field radar speed measurements consisting of a total of 100 vehicles for each roadway now striped for four or more travel lanes and a total of 50 vehicles for each segment having two marked travel lanes were made. Field tally sheets included engineering calculations of the average or mean speed, the 85th percentile or critical speed, and the 10 mile per hour pace speed containing the greatest number of observations. 1415 East 17th Street. Santa Ana, California 92701 . (714} 558-1952 A Berryman & Stephenson Industries Company City of Tustin -2- April 12,'1988 Mr. Bob ~edendecker 2. Accident records for each street segment for the last three years were r~viewed and summarized. Accident frequencies were then compared with studies published by other agencies to determine if the accident experience is higher or lower than other similar roadways. 3. Highway, traffic and roadside characteristics which are not readily apparent to motorists were determined based upon a field review of each segment. Characteristics noted included the n~m~er of travel lanes, frequency of driveways, density of on-street parking, predominate land use, crosswalks, horizontal and vertical alignment, and traffic controls. The previous information was gathered and summarized on a survey sheet for each street segment. Recommendations for speed limits based upon the current prevailing conditions w~r.e then developed. Attached is a ~ary listing for the nine segments which were surveyed within the City. The listing indicates the current posted speed limit and the recommended posted speed limit. As noted, no changes are recommended on the nine (9) street segments. In addition to the summary listing, ~he survey sheets for each street segment are attached for your files. Reoommen~e~ It is recommended that this specific Engineering and Traffic Survey report be forwarded to City Council for their apprgval. Further, staff should be instructed to prepare an O~dinance to amend the City's Municipal Code for the City Council's consideration. After approval, the City Clerk should be directed to file a copy with the appropriate authorities for enforcement and prosecution purposes. Sincerely yours, BSI CONSULTANTS, INC. Dennis D. Barnes, P.E. ProJect Manager DDB:ddb Attachments Bryan Ave. Bryan Ave. Bryan Ave. .ih St. Main St. Main St. Main St. Main St. Main St. CITY. OF TUSTIN ENGINEERING AND TRAFFIC SURVEY 1988 SUMMARY OF RECOMMENDATIONS Boundaries Main St. to Redhill Ave. Redhill Ave.to Farmington Rd. Farmington Rd. to Browning Ave. West City Limits to Williams St. Williams St. to Myrtle Ave. Myrtle Ave. to "B# St. "B" St.to Prospect Ave. Prospect Ave. to Newport Ave. Newport Ave. to Bryan Ave. C~rrent SPeed Limit 40 4O 4O 4O 40. 4O 3O 4O Recommended SPeed Limit 4O 4O 4O 4O 4O 4O 3O 40 40