1997 AGN NOV 18 I02 - Laserfiche WebLink

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11/05/97 21*.42 714 552 4357 PAGE 3 OF 8 Brian Baden 2 This is a short method of speed zoning based on the premise that a reasonable speed limit is one that conforms to the actual behavior of the majority of motorists, and that by measuring motorists' speed, one will be able to select a speed limit that is both reasonable and effective. Other factors that need to be considered are the most recent two year accident record, roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, horizontal and vertical roadway profile conditions, intersection spacing and geometric offsets, commercial and residential driveway characteristics, pedestrian traffic in the roadway without sidewalks, etc. The speed limit is ng[My established at the first five mile per hour increment below the 85th percentile speed. The 85th percentile speed is an accepted guideline for determining the prevailing speed among transportation/traffic engineering agencies. While the 85th percentile has been accepted as representing the "reasonable man" by the courts, it is not a mandatory requirement and it cannot be applied as the only measure without the application of engineering judgement. The establishment of a speed limit of more than 5 miles per hour below the 85th percentile is done with great care to insure that the speed limit meets the needs of the motoring public and is legally defensible. With this information in mind, we can summarize the two Engineering Surveys in question as follows: Washington St. ftM Reche!Ganvon Rd. To W"t miagn Av. The current posted speed for this road section is 45 MPH. The 85h percentile of the most recent speed survey dated June 13, 1997 was 53 MPH. Based on the most recent speed survey, the new recommended speed limit for this section of roadway is 50 MPH. Support for this recommendation is based on the following data from the attached Engineering and Traffic Survey Summary: Low accident history: Roadway design: Commercial and residential driveways: Pedestrian traffic: Roadside development: 3.11 accidents per year %mille, 4 lane curvilinear 116 ft. wide with 40 ft. center median No driveways Light pedestrian traffic Light development There are no existing highway, traffic or roadside conditions in this road section to support an 1dd_ifjgn-aI reduction from the 85hhpercentile speed survey. Hunts Ln. from Barton Rd. To Redlands 1311. The section of roadway is currently not posted. The 85, percentile of the most recent speed survey dated June 12, 1997 was 52 MPH. Based on the most recent speed survey, the recommended speed limit for this section of roadway is 50 MPH. Support for this recommendation is based on the figowing data from the attached Engineering and Traffic Survey Summary: