1991 AGN JUL 16 I22 - Laserfiche WebLink

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C', Traffic PLANNING MANUAL 8-503.3A 4. On a street entering a legally established through highway or street. 5. On a minor street where the safe approach speed Fdistan e intersection i ss than 10 miles per hour. OP sign is not a "cure-all" and is not a sub - for other traffic control devices. Many times the ra STOP sign can be eliminated if the sight e is increased by removing obstructions. installation of STOP signs at locations where e unexpected or where approach speeds are ould be avoided if possible because they may accidents. However, if there is no alternative OP sign, then an advance Code W17R STOP D sign and appropriate pavement markings should be placed in conjunction with it. Publicity through the radio and press is highly desirable when STOP signs are installed and espe- cially when it is necessary to change their location. Any of the following conditions may warrant a four-way stop sign installation: 1. Where traffic signals are warranted and the need is urgent, the four-way stop is an interim meas- ure that can be installed quickly to control traffic while arrangements are being made for the signal installation. 2. An accident problem, as indicated by five or more reported accidents of a type susceptible of cor- rection by a four-way stop installation in a 12 - month period. Types of accidents susceptible of R2R(50) Whl:r, on Black 6" Serl*s [ le"*rs—lines 1 and 2 1S" Series E numerals—line 3 (Also available in 24" x 30" and 42" x 60" sizes) correction include right angle and left turn col- lisions. 3. Minimum volume warrant: a. The total vehicular volume entering the inter- section from all approaches must average at least 500 vehicles per hour for any eight hours of an average day, and b. The combined vehicular and pedestrian vol- ume from the minor street or highway must average at least 200 units per hour for the same eight hours with an average delay to minor street vehicular traffic of at least 30 seconds per vehicle during the maximum hour. c. When the 85 -percentile approach speed of the major street traffic exceeds 40 miles per hour, the minimum vehiculer volume warrant is 70 percent of the above requirements. A . four-way stop sign installation is a useful traffic control measure when other available means of control are not adequate. It should not be used unless the volume of traffic on the intersecting roads is about equal and is undesirable at low -traffic intersections. A traffic signal installation is the more satisfactory solution. At a four-way stop intersection each stop sign may be supplemented by a separate plate mounted just below it, reading "4 -way" in black letters on a white background. The standard size for such plate is 12 inches by 6 inches. POLICY: Use the R2R sign to give notice of a re- stricted prima facie speed limit. This sign is available for 25, 30, 35, 40, 45, 50, 55 and 60 mile per hour limits and for 20 mile per hour truck limits on descending grades. (See Section 8-703.) The minimum sized R211 sign that shall be installed on a State highway is 36"x45". On freeways 48" x 60" signs shall be used. The R2R sign may be installed after an engineering and traffic survey has been conducted. (See Sections 22354 and 22358 of the Vehicle Code.) Section 21403 of the Vehicle Code specifies the size of letters and numerals that must be used on speed restriction signs installed after January 1, 1964. It also provides that the letters and numerals on such signs shall be reflectorized, or illuminated from sunset to sunrise. Further, speed restriction signs erected prior to January 1, 1964, shall conform to the new requirements or to the statutory requirements in effect at the time the signs were erected. LOCATION: Erect in the standard position on the right shoulder at the beginning of the restricted speed zone. When speed zones are longer than one mile, intermediate signs may be posted at approximate 1 -mile intervals. On freeways install following each interchange or at approximate 1 -mile intervals where interchanges are widely spaced, for three or more lanes in each direction, dual installations will be used.