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Home My WebLink About2007-06-04; Traffic Safety Commission; ; Install a yield sign on westbound Janis Way at Donna Drive to assign right-of-way( CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: June 4, 2007 LOCATION: Intersection of Donna Drive/Janis Way INITIATED BY: Jerry Tannen 3535 Bedford Circle Carlsbad, CA 92008 ITEMN0.6A REQUESTED ACTION: Install a yield sign on westbound Janis Way at Donna Drive to assign right-of-way. BACKGROUND: In a telephone call to staff, Mr. Tannen expressed concern about the ability to see vehicles on Donna Drive that are approaching the intersection of Janis Way when viewed by westbound drivers on Janis Way. He suggested that a yield sign be installed on westbound Janis Way at Donna Drive. Shortly after Mr. Tannen's request, staff received a telephone call from another citizen that suggested an all-way stop be established at the Donna Drive/Janis Way intersection. DATA: Donna Drive and Janis Way are local streets in the northwest quadrant that are located easterly of Carlsbad High School. Donna Drive has a posted 25 mile per hour prima facie speed limit, serves as a collector street, and has a curb-to-curb width that varies between 36 feet and 40 feet. The 24-hour two-way average daily traffic volume on Donna Drive northerly of Chestnut Avenue obtained in November 2006 was 1,079 vehicles. The Donna Drive/Janis Way intersection is uncontrolled and is located about 0.2 miles north of Chestnut Avenue. It is a four-leg intersection with Janis Way terminating in a cul-de-sac easterly of Donna Drive. Cross-gutters, for drainage purposes, installed on Donna Drive in an east-west orientation on both the north and south sides of Janis Way create a "dip" in the road and function as a speed break. Drivers in both directions on Donna Drive approaching the Janis Way intersection are advised of the cross-gutters by placement of a "DIP" advisory sign on Donna Drive. Each stop sign request received by staff results in a traffic study being undertaken. Stop signs can cause substantial inconvenience to drivers and should be used only where warranted. One of the conditions at an intersection that may warrant consideration of installing a stop sign on the minor street is when the safe approach speed to the intersection is less than 10 miles per hour. The safe approach speed to the intersection on the minor leg is typically evaluated when there is a request to install a stop sign only on the minor street at an intersection. For the purpose of this report, the lower volume street which is Janis Way, will be considered the minor street and Donna Drive will be considered to be the major street. ( ( CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: June 4, 2007 (continued) ITEMNO. 6A Corner sight distance is an important design feature. Drivers stopped on the minor road should have sufficient sight distance when departing to turn right or left, or to cross the intersection when a vehicle on the major road comes into view. Drivers approaching the subject uncontrolled intersection consisting of four legs have right-of-way assignment based upon the rules of the road. However, the driver should have an unobstructed view of the entire intersection and sufficient length along the intersecting street for the driver to anticipate and avoid conflicts with approaching vehicles. When a driver on the minor street is traveling towards the major street, they reach a decision point where it is necessary to determine if braking to a stop is required because of a vehicle on the major street approaching the intersection may constitute a conflict. The decision point on the minor street must allow the driver sufficient distance to view to the driver's right and left an approaching vehicle that is on the major street. The operator of the vehicle on the minor street, generally not having the right-of-way, can then initiate actions to slow, stop, or avoid a conflict with other vehicles, as necessary, when the proper clear sight triangle is provided (see Exhibit 2). For the analysis of local streets, the minor street decision point is assumed to be 50 feet from the intersection conflict point when the vehicle on the minor street has an approach speed of 10 miles per hour. In general, a distance of 155 feet (stopping sight distance for 25 miles per hour) along the major street, in this case Donna Drive, must be provided to minor street drivers to view vehicles approaching the intersection. If the vehicle on the major street cannot be seen from the decision point on the minor street, a stop sign can be considered for installation on the minor street. At the subject intersection, the driver on westbound Janis Way has sight distance limited to 76 feet when looking to the south. For eastbound drivers on Janis Way, the corner sight distance is limited to 92 feet when looking to the south for northbound vehicles approaching on Donna Drive. Limitations to sight visibility exist on the southeast and southwest corners of the intersection due to a fence and several pine trees, respectively. Consequently, the 10-mile per hour safe approach speed criteria is not being met and a STOP sign can be considered for installation on both legs of Janis Way. Due to sight distance limitations, a yield sign would not be the appropriate control for the minor street. Staff conducted a stop warrant analysis (worksheet attached) to determine if the intersection should be considered for all-way stop. Traffic volumes approaching the intersection over a 24-hour period are low, as indicated on Table A. Because of the low volumes and the absence of a collision history at the intersection, warrants are not met to consider establishing an all-way stop at the Donna Drive/Janis Way intersection. Stop signs are not recommended for Donna Drive at Janis Way. As previously indicated, vehicle speeds on Donna Drive are reduced at Janis Way by the cross-gutters on Donna Drive. RECOMMENDATION: The Traffic Safety Coordinating Committee recommends the installation of a stop sign on both legs of Janis Way at its intersection with Donna Drive and that no stop signs be installed on Donna Drive at Janis Way. NECESSARY CITY COUNCIL ACTION: The City Council must adopt an ordinance to establish the stop signs as recommended. NOT TO SCALE PROJECT NAME ( ( LOCATION MAP LEGEND: 0 STUDY INTERSECT/ON PROPOSED STOP SIGN PROPOSED STOP SIGNS ON JANIS WAY AT DONNA DRIVE DRAl+N BY: SCOT[ EVANS, CARLSBAD ENGINEERING DEPT. 5/17/07 C: \TRAFFIC\DONNA_JAN/S LOCATION MAP.Dlte CAMEO RD. EXHIBIT 1 TITLE I ' J JANIS WAY (MINOR STREET) ..J '<:( ~ (.) G '<:( ~ ~ UJ E:} :::::;: p a:: Q: l1:J li) Cl~ li) ...... :SC (/) <:: a:: <:~ a '<:( Cl~ _j DECISION POINT 50' I \ l I• 50' • I ,----. ~DECISION POINT I I I I I I I REQUIRED I LINE OF I SIGHT I I I I NOT TO SCALE l __ JANIS WAY (MINOR STREET) -----7 REQUIRED/ LINE OF SIGHT I I I~ I I I I NOT TO SCALE DONNA DRIVE AT JANIS WAY INTERSECTION APPROACH SIGHT TRIANGLE DRA'r'tN BY: SCOTT EVANS. CARLSBAD ENGINEERING DEPT. 7 '2J 04 C: 7RAF1'/C STOP SIGN STOP SIGN-DONNA-JANIS2.DWG EXHIBIT 2 TIME· 0000-0100 0100-0200 0200-0300 0300-0400 0400-0500 0500-0600 0600-0700 0700-0800 0800-0900 0900-1000 1000-1100 1100-1200 1200-1300 1300-1400 1400-1500 1500-1600 1600-1700 1700-1800 1800-1900 1900-2000 2000-2100 2100-2200 2200-2300 2300-2400 TOT.6.L ( TABLE A INTERSECTION APPROACH COUNTS DONNA DRIVE/ JANIS WAY APRIL 18, 2007 Ql0ECTION . . NIB SIB E/B' W/B 0 1 0 0 1 1 0 0 1 1 0 0 2 0 1 2 0 1 0 5 2 1 0 0 8 9 3 11 103 59 7 11 20 26 6 13 30 28 4 17 19 27 1 11 24 32 10 17 35 43 4 12 21 21 4 6 59 81 10 21 26 40 11 16 28 33 11 11 34 33 5 18 15 23 2 7 20 27 3 7 17 17 1 3 13 16 0 2 5 5 0 5 2 0 0 0 •>•. 485 ·.• 525 ·> . 195 SUBTOTAL 1 2 2 5 6 3 31 180 65 79 58 83 94 52 171 93 83 90 47 57 38 31 15 2 1,288 . I I California MUTCD ( (FHWA's MUTCD 2003 Revision 1, as amended for use in California) MULTIWAY STOP CRITERIA Transportation Division, Public Works Department City of Carlsbad CALC JTK DATE DATE 4/23/07. -------CHK ,~ l Major St: Donna Drive Critical Approach Speed Critical Approach Speed ___ 3_3 ___ mph Minor St: Janis Way Critical speed of major street traffic > 40mph --------------------D Otherwise ---------------------------------------------[8] ___ n_/a ___ mph RURAL (R) URBAN (U) '.~~!~~~W:f ~ry~J~~~~J~:~~~,:~r~~~~!~~:~~~~~~?•<' ••• ::.f~m,,~nr~~::·,~:;;;,;~n Where traffic cqntrol signals are justified, the MUL TIWAY STOP is an interim measure that can be installed quickly to control traffic while arrangements are being made for the installation of the traffic control signal. A crash problem, as indicated by 5 or more reported crashes within a 12-month period that are susceptible to correction by a MUL TIWAY STOP installation. Such cra~hes include right-turn and left- turri collisi6_r1s as well as right-angle collisions. No Reported.Collisions at this Location '.QJ\iltadtiii¢)fiiMitl'iltfum~'nfrat,f;I/Q,X'{~fu,m:~'s{· \.~·. X ,, . . . . . . . . . . . (All Parts C.1, C.2a and C.2b below must be satisfied) C.1 Major Street Vehicular Volume 0700 0800 0900 u R -0800 -0900 -1000 Both Approaches 300 210 162 46 58 Major Street 1100 1400 -1200 -1 500 56 140 C.2 a. Minor Street Vehicular, Pedestrian & Bicycle Volume 0700 0800 0900 1100 1400 u R -0800 -0900 -1000 -1200 -1500 Both Approaches 200 140 18 19 21 27 31 Minor Street b. Minor Street Vehicle Delay 1500 1600 -1600 -1700 66 61 1500 1600 -1600 -1700 27 22 Peak Peak Hour Minimum Delay Requirement, Hour Volume seconds per vehicle n/a n/a 30 (Urban), 21 (Rural) REQUIREMENT CRITERIA 8. Four or more reported crashes within a 12-month period. THREE CRITERIA C.1. Major Street Volume of at least 240 vehicles per hour SATISFIED 80% C.2a. Minor Street Volume of at least 160 units per hour C.2b. Minor Street Average Delay of at least 24 seconds per vehicle Yes □ No[8] 1700 -1800 Hour 67 Average= 82.00 Yes □ No[8] 1700 -1800 Hour 23 Average= 23.50 Yes O No O NIA ~ Average Delay, seconds per vehicle n/a FULFILLED Yes □ No [8] Yes D No [8] Yes D No[8] Yes D Nq_O