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Home My WebLink About1994-11-08 - AGENDA REPORTS - ENGR TRAFFIC SURVEY (2)AGENDA REPORT CONSENT CALENDAR DATE: November 8, 1994 SUBJECT: ASHBORO DRIVE - ENGINEERING AND TRAFFIC SURVEY Resolution No. 94-126 DEPARTMENT: Community Development BACKGROUND At the September 27, 1994 City Council Meeting, the Council directed staff to conduct an Engineering and Traffic Survey on Ashboro Drive between Whites Canyon Road and Ermine Street. The request was based on the findings of a traffic study that was presented to the City Council at that meeting. The traffic study addressed various traffic concerns raised by the area residents living in the vicinity of Steinway Street, and the need to establish an appropriate speed limit on the neighborhood streets. Staff has already installed 25 mph speed limit signs on Steinway Street. Ashboro Drive is presently posted at 25 miles per hour, but the posted speed limit has not been justified by an Engineering and Traffic Survey. According to the California Vehicle Code, a study shall be performed every five years where enforcement involves the use of radar or another electronic device to measure the speed of moving vehicles. EXISTING CONDITION Ashboro Drive between Whites Canyon Road and Ermine Street is a residential collector street with curb, gutter and sidewalk along both sides. The street has one travel lane in each direction and on -street parking is permitted. The street width varies from 38 to 40 feet and is about 1,250 feet long. The street generally runs east to west between Whites Canyon Road and Merryhill Street, and north to south between Merryhill Street and Ermine Street. Horizontal and vertical curves exist on the northern half of this street and only a vertical curve along the southern half. No private driveway is fronting the street and the posted speed limit is 25 mph. ANALYSIS A review of the accident records from January 1992 to July 1994 (31 months) revealed that three intersection and one midblock accidents were reported on the subject street segment. Adopted:, Agenda Item: RESOLUTION NO. 94-126 November 8, 1994 - Page 2 Further evaluation of these reports indicate that none of the above were speed related accidents. The sight visibility for all the side streets were also evaluated and measured. The minimum sight visibility of 300 feet is available at the intersection of Thorley Ct. which is appropriate for a 35 mph speed zone. All other roadways intersecting Ashboro have sufficient sight visibility. The northern portion of this road was evaluated for possible installation of advisory speed using a device called the ball bank indicator. This part of the analysis revealed that the advisory speed sign of 25 mph is recommended through the curved portion of Ashboro Drive which is almost half of the entire stretch under study. Speed data was collected on the subject street and the following are the results: 85TH PERCENTILE SPEED 36 mph 10 MILE PACE (% OF VEHICLE) 29-38 mph (73%) The speed limit normally should be established at the 85th percentile speed (defined as the speed at, or below, which 85 percent of the traffic is moving) or the nearest five miles per hour below it. However, in matching with existing conditions and with the traffic safety needs of the community, engineering judgement may indicate the need for a further reduction. Staff recommends the speed limit to be established at 30 mph, which is 6 mph below the 85th percentile speed for the following reasons: The street is a short segment and horizontal and vertical curves exist along the northern half of it, which require installation of an advisory speed of 25 mph. Any speed limit higher than 30 mph would require the driver to slow down suddenly to achieve the advisory speed of 25 mph. Adopt Resolution No. 94-126, establishing a Prima Facie Speed Limit of 30 miles per hour on Ashboro Drive between Whites Canyon Road and Ermine Street, and direct staff to install the necessary signs to effect this Resolution. ATTACHMENTS Resolution No. 94-126 Vicinity Map AY:lkl m.,d\.,94-126.ny RESOLUTION NO. 94-126 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF SANTA CLARITA, CALIFORNIA ESTABLISHING PRIMA FACIE SPEED LIMIT ON ASHBORO DRIVE WHEREAS, the California Vehicle Code (Sections 22357 and 22358) permits local authorities, upon the basis of an Engineering and Traffic Survey, to establish prima facie speed limits on highways within their jurisdiction; and WHEREAS, Section 40802(b) of the California Vehicle Code requires that speed limits be justified by an engineering and traffic survey every five years in order to use radar for enforcement; and WHEREAS, the effective and efficient use of radar for traffic speed enforcement can enhance highway safety within the City; NOW THEREFORE, the City Council of the City of Santa Clarita does resolve as follows: Section 1. That prima facie speed limits of 30 mph shall be established on Ashboro Drive between Whites Canyon Road and Ermine Street. Section 2. That the Los Angeles County Sheriff conduct appropriate enforcement of the prima facie speed limits established by this resolution. Section 3. That staff install the necessary signs to effect this Resolution. PASSED, APPROVED AND ADOPTED this _day of 1994. Mayor ATTEST: City Clerk RESOLUTION NO. 94-126 November 8, 1994 Page 2 STATE OF CALIFORNIA COUNTY OF LOS ANGELES j § CITY OF SANTA CLARITA I, , DO HEREBY CERTIFY that the above and foregoing Resolution was duly adopted by the City Council of the City of Santa Clarita at a regular meeting thereof, held on the day of 1994 by the following vote of Council: AYES: COUNCILMEMBERS: NOES: COUNCILMEMBERS: ABSENT: COUNCILMEMBERS: City Clerk AY:lkl mancil\ar94-I26.ay �N 1 CRE E 1 � I > DRASiN " 4<08URYi a pF I�Strp+rt t �. o- 1 $a vEw c+ q 1 FDl N LOS _ CITY OF i a yj 1 t L 57 I a 5T a NEWHOUSE ST ROCKT Oy a= EDN 5T G SHANGRI-LA . 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