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Home My WebLink About1995-01-09; Traffic Safety Commission; ; Establish a prima facie speed limit on Rancho Santa Fe Road from Olivenhain Road to La Costa Avenue at 50 MPHCITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: January 9, 1995 ITEM NO. _filL LOCATION: INITIATED BY: Rancho Santa Fe Road from Olivenhain Road to La Costa A venue City Traffic Engineer REQUESTED ACTION: Establish a prima facie speed limit on Rancho Santa Fe Road from Olivenhain Road to La Costa Avenue at 50 MPH. BACKGROUND: Sections 22357 and 22358 of the California Vehicle Code authorizes local authorities to establish a prirna facie speed limit on the basis of an Engineering and Traffic Survey. The Engineering and Traffic Survey identifies such details as prevailing speed, accident history, traffic volumes, and other roadway factors. At the present time, the subject segment of Rancho Santa Fe Road has a 45 mile per hour prima facie speed limit. Results of the Engineering and Traffic Survey do not support a 45 mile per hour speed limit. However, north of La Costa A venue and south of Olivenhain Road, the existing 45 mile per hour prima facie speed limit is supported by the results of an Engineering and Traffic Survey. DATA: Rancho Santa Fe Road is identified on the City's Circulation Element of the General Plan as a prime arterial. The roadway was improved in 1986 by widening, adding lanes, and constructing the road segment to prime arterial standards. The road width varies from approximately 80 feet on the northeast end of the subject segment to almost 100 feet in width on the southwest end. On both sides of this arterial road are curb and gutter, sidewalk, and street lights. In the center of the road is a fully improved and landscaped median. Traffic volumes on Rancho Santa Fe Road have increased dramatically over the past several years. In 1994, 24-hour vehicle counts showed a total of 20,324 vehicles using this road segment. Over the past 24 months, there have been seven accidents reported within this road segment, four of which related to excessive speed. The accident rate per million vehicle miles is 0.44 for the two-year period. This is less than 25% of the expected accident rate (2.44) for this class of improved roadway. In December 1994, staff conducted a speed survey on the subject segment of Rancho Santa Fe Road (survey attached). Table 1 lists the results of this survey. TABLE 1 SPEED SURVEY RESULTS 12/07/94 500 sfo Camino De Los Coches 47 to 57 MPH 84% 55 MPH CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION :MEETING OF: January 9, 1995 (continued) ITEM NO.___@_ The existing 45 MPH prima facie speed limit for this road segment cannot be supported based upon results of the updated Engineering and Traffic Survey. The subject segment has a 60 MPH design speed and a critical speed of 55 miles per hour. There are no obstructions that reduce sight distance to less than required by the design speed. No residential driveways or other driveways are located on this segment of roadway. Mission Estancia Elementary School is located on Calle Barcelona with access provided from Rancho Santa Fe Road. A yellow crosswalk has been striped on Rancho Santa Fe Road at the Calle Barcelona intersection. An adult crossing guard assists students with crossing Rancho Santa Fe Road. RECOM:MENDATION: The Traffic Safety Coordinating Committee recommends that the prima facie speed limit on Rancho Santa Fe Road from Olivenhain Road to La Costa A venue be established at 50 MPH based upon the results of the Engineering and Traffic Survey. NECESSARY CITY COUNCIL ACTION: An ordinance will be required to be adopted by the City Council to establish the prima facie speed limit as recommended. LOCATIO N (_J ~ PROPOSED SPEED ZONE 0 <( MAP 0 a:: ::=----=--=---C--::=-AM~INO DE LOS COCHES w LL PROJECT NAME RANCHO SANT A FE ROAD PROPOSED 50 MPH SPEED ZONE EXHIBIT 1 CITY OF CARLSBAD ENGINEERING AND TRAFFIC SURVEY STREET: ___ R .... a=n"""c""'"h"""o .... S __ a=n:..;.;t=a'"""F...;;e ....... R __ oa=d;:.:_ _____________ _ DATE: ____ 12=-/ ...... 08~/~94 ____ _ A. Prevalllng S~eed Data: Date of Speed Survey Location of Speed Survey 85th Percentile 10 MPH Pace Percent in Pace Posted Speed Limit B. Accident Hlsto!}'.: (11/01/92 to 10/31/94) Speed-Related Accidents Total Accidents Acc./Million Veh. Miles c. Traffic Factors: Average Daily Traffic Traffic Controls Pedestrian/Bicycle Traffic Bicycle Lanes On-Street Parking Other D. Roadwai Factors: Street Classification Design Speed Length of Segment Roadway Width Number of Lanes Vertical Alignment Horizontal Alignment Sidewalks Driveways Street Lighting E. Adiacent Land Uses: 4 7 0.44 Direction: Northbound & Southbound 12/07/94 500' South of Camino De Los Coches 55 MPH 47 to 57 MPH 84% 45 MPH 20,324 on 5/17/94 (Total) at 500' South of Calle Barcelona Signals at Olivenhain Road, Calle Barcelona, Camino De Las Coches, & La Costa Avenue Yes, Both Sides of Road Yes, Both Sides of Road None Bus Route & Truck Route Both Sides Prime Arterial 60MPH 1.08 Mi. 80' Typical, 40' Each Side of 18' Wide Median 3 Each Direction, Additional Lanes at Intersections (Left-Turn, Right-Turn) Moderate Grades Curvilinear Both Sides None Both Sides A Master Planned Community with Residential, School, Church and Park Land Uses F. Remarks: This road segment is a portion of a regional arterial system that serves adjacent communities to the freeway corridor. An elementary school crossing exists on Rancho Santa Fe Road at Calle Barcelona. There is also a 25.7 acre park and a high school served by this arterial. The park and high school are located on Camino De Los Coches. G. Traffic Engineer's Recommendation (Explanation): This speed zone satisfies the conditions of Section 627 of the California Vehicle Code and has been prepared and evaluated in accordance with the CAL TRANS Traffic Manual with respect to design and prevailing speeds, accident history, pedestrian activity, driveway spacing, stopping sight distance, and roadway and traffic conditions. A speed limit posting of 50 MPH is found to be appropriate and justified. NOTE: Appropriate speed survey(s) is/are attached hereto and made a part hereof. CITY OF CARLSL,AD SF ,ED SURVEY DATE: ~/,2.,._-___ 7_--1--1f'/----TIME: /() ,'J26 to 1/."tJS A,M. TOTAL VEHICLES: _ _._6 ...... rJ ........ tJ __ _ WEATHER: ____ C.:a....w:6=tJ~[) ___________ _ CRITICAL SPEED: __ s __ s ____ MPH LOCATION: RAAIClll'J SANTA FE 6t2f/() ~ Sdt?' % C--9t{/N~ /J£ t~s Uer/ES PACE SPEED: 1/ 7 to S7 MPH OBSERVER/RECORDER: ____ J"W........._~C,__ _______ _ CARS IN PACE: Bf % Posted Speed Limit: fS MPH NE SB Direction of Travel Direction of Travel MPH II 1. # 1. i1 ~ . j MPH b~ 65 64 64 63 63 62 62 61 61 60 I I ,,, ' ,)f 60 59 ;;, .? '>(J ;;" "' ) X X 59 58 -~ ' . ., -· J X X y 58 57) .. j .? . :J ' .J' X 57 561) J u 'I ' -:, '{ :> X X 56 551..1 X )(' I 1 J I u /4~ 7 X )(' X )( X X y 55 541) -:, I "'J I 54 53 IX :1 I -..!.-'I £ X Y 53 52 X ,I ) X 4 i:> /, 1 ) ) "7 1 ll X Ji X,, 52 51 ')'' ,I ~ , 'I J J I 4 I ' 7 17 X /\ X 1K X ..v I) I)( " 51 so .... ) ~ ,)( K IX A f I I /, I "7 ' ' ,-X ,x. ,., ,, I) so 49 .ii: "' ) -' ~ ,, ' ~3 ~ ~ I) i,,' 1,-49 48,, I) l.,1 -~ .,. ,; -:J k X X' [XI) I,' l,) 48 471) y IX' IX ' 7 -' 5' I:' ~~ I) 1.,1 )I 47 46 J J .,.:> _:,) I ~ I IX 46 45 ~ IX" ~, i . 4::, 45 44 "';1 ~ 44 43 ~ .2 43 42 p j I 42 41 41 40 40 39 39 38 38 37 37 36 36 35 35 34 34 33 33 32 32 31 31 30 ' 30 29 29 28 28 27 27 26 26 25 25 24 24 23 23 22 22 21 21