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HomeMy WebLinkAbout6.3 Portage/Maple Yield ►i CITY OF DUBLIN AGENDA STATEMENT City Council Meeting Date: June 8, 1987 SUBJECT: Public Hearing: Yield Right-of-Way Portage Road at Maple Drive EXHIBITS ATTACHED: 1) Draft Ordinance 2) Report from TJKM 3) Location Map RECOMMENDATION: 1) Open Public Hearing 2) Receive Staff report and public testimony 3) Question Staff and the public 4) Close Public Hearing and deliberate 5) Waive reading and adopt Ordinance for installation of a Yield sign on an urgency basis. FINANCIAL STATEMENT: Approximate cost of Yield sign is $150. DESCRIPTION: This request for some type of control at the Portage Road/Maple Drive intersection was made by a staff member during a meeting of the Traffic Safety Committee: TJKM has studied the intersection, as indicated in the attached report, and finds as follows: Visibility Visibility for southbound traffic on Maple Drive is clear; however it is limited for northbound traffic due to the presence of two trees on the southwest corner of the intersection. The trees also limit visibility for eastbound drivers on Portage Road to the south but not to the north. Traffic Volume Traffic approaching on Portage Road totaled 827 vehicles per day. Traffic approaching on southbound Maple Drive totaled 1,122 vehicles per day and on northbound Maple Drive, 818 vehicles per day. Peak hour volume on these approaches was 110, 113, and 109 vehicles, respectively. Accident History There were no reported accidents in 1984 or 1985; however, there were three reported accidents between January 1, 1986, and May 15, 1987. One of these was a head-on sideswipe involving property damage only. The other two were collisions with parked vehicles, both at night. The fact that no accidents occurred during 1984 and 1985 suggests that these accidents were random events, not due to design inadequacies. Analysis and Recommendation If visibility is restricted at an intersection, one of the criteria used to determine whether a YIELD or STOP sign is appropriate is "Safe Approach Speed." Determination of this factor involves analysis of the prevailing speed on the major street, distance to the obstruction, availability of on- street parking, and width of the streets. Based on these factors, it was determined that the "Safe Approach Speed" on Portage Road is approximately 12 m.p.h. A YIELD sign is generally recommended if the safe approach speed is less than 15 m.p.h. , a STOP sign if less than 10 m.p.h. Staff recommends that the City Council conduct a public hearing, waive the reading and adopt the attached Ordinance for installation of a YIELD sign on Portage Road at Maple Drive. ITEM NO. 6.0 COPIES TO: . TJKM ORDINANCE NO. -87 AN ORDINANCE OF THE CITY OF DUBLIN ESTABLISHING TRAFFIC REGULATIONS The City Council of the City of Dublin does ordain as follows: Section 1. YIELD RIGHT OF WAY: Article 3, relating to "Yield Right-of-Way Intersections", of the Alameda County Ordinance Code previously adopted by the City of Dublin is amended by the addition of Section 6-55.99 to read: 6-55.99 Portage Road, at the intersection of Maple Drive. Section 2. IMMEDIATE EFFECT: This Ordinance shall take effect immediately upon its enactment because the adoption and immediate effect thereof is necessary in order to protect vehicular and pedestrian safety. Section 3. POSTING OF ORDINANCE: The City Clerk of the City of Dublin shall cause this Ordinance to be ~osted in at least three (3) public places in the City of Dublin in accordance with Section 36933 of the Government Code of the State of California. PASSED AND ADOPTED by the City Council of the City of Dublin on this 8th day of June, 1987. AYES: NOES: ABSENT: ATTEST: Mayor City Clerk MEMORANDUM 4637 Chabot Drive, Suite 214 Pleasanton Ca. 94566 (415) 463-0611 DATE: TO: FROM: SUBJECT: May 29, 1987 Lee Thompson Michcllc DeRobcrtis Portage Road and Maple Drive PUBL!C WORKS At a recent Traffic Committee meeting, staff asked TJKM to analyze thc need for traffic control at the intersection of Portage Road and Maple Drive. The analysis included a field survey, traffic counts, and a review of the accident history. The field survey included an overview of existing physical and traffic conditions. The traffic counts were used to compare with the warrants for installing traffic control devices. The accident history was reviewed to uncover any traffic patterns related to the collisions which may be correctable by traffic engineering measures. Field Survey Maple Drive and Portage Road are two-lane residential roads with single family home frontage. The intersection of Maple Drive and Portage Road is currently uncontrolled with no lane striping or pavement markings. The nearest intersections with traffic control devices are Portage Road at Lewis, which has three-way STOP sign control, Maple Drive at York Street, which has a one-way STOP on Maple Drive, and Maple Drive at Clark Drive, which has three-way STOP sign control. Parking is allowed on both sides of the streets. Visibility for southbound traffic on Maple Drive to the approach of Portage Road is clear. Visibility for northbound traffic on Maple Drive to the approach of Portage Road is limited due to two tall palm trees on the southwest corner of the intersection. These trees also obscure the visibility for eastbound traffic on Portage Road to the south, but not to the north. These existing conditions are depicted in Figure 1. Traffic Volumes Forty-eight hour approach volumes were taken on May 13 -15, 1987 at the three approaches of the intersection of Maple Drive at Portage Road. The counts recorded the daily and hourly traffic volumes for eastbound traffic approaching the intersection on Portage Road and for the southbound and northbound traffic approaching the intersection on Maple Drive. The traffic approaching on Portage Road totalled 827 vehicles per day (vpd). The traffic approaching on southbound Maple Drive totalled 1122 vpd and the traffic approaching on northbound Maple Drive totalled 818 vpd. The peak hour volume on each approach was 110, 113, and 109 vehicles, respectively. Accident History There were three reported accidents in the time period from January I, 1984 through May 15, 1987. All.three accidents occurred in either 1986 or 1987. There were no reported accidents at this intersection in 1984 or 1985. One of the accidents was a head-on side swipe involving property damage only. The remaining two accidents were collisions with parked vehicles; both occurred in the PLEASANTON · SACRAMENTO · FRESNO · CONCORD Mr. Lee Thompson -2- May 29, 1987 darkness and involved property damage only. The fact that no accidents occurred in 1984 or 1985 suggests that these accidents were random events and are not due to design inadequacies. Analysis When restricted visibility exists at an intersection, one of the traffic engineering criteria used to determine if a YIELD sign or a STOP sign is appropriate is the "Safe Approach Speed" on the minor street. The determination of the safe approach speed involves consideration of such factors as the prevailing speed on the major street, the distance to the obstruction, the availability of on-street parking, and the width of the streets. Based on these factors, it was determined that the safe approach speed on Portage Road is approximately 12 mph. In general, a YIELD sign is recommended if the safe approach speed is less than 15 mph and a STOP sign is recommended if the safe approach speed is less than 10 mph. Recommendation Based on the field review, traffic volume counts, accident history, and analysis of the safe approach speeds, it is recommended that a YIELD sign be installed for traffic approaching the intersection on Portage Road. This recommendation is depicted in Figure 1. Given the safe approach speeds on Portage Road, the relatively light volumes on all approaches and the fact that it is a "Tee" intersection, more restrictive control such as a one-way STOP sign is not recommended. nlc Attachment 157-001M. 6MD LEGENDYIELD si R34 NO U TURN SNS STREET NAME SIGN '-~-' INSTALL NEW SIGN MAY 1987 NO SCALE ~RANSPORTATION CONSULTANTS