RES 85144 - Laserfiche WebLink

Mr. Robert L. Warnick -2- February 1, 1985 ( ~lonitoring facilities have already been installed at Hopyard Road/Owens Drive, and the set-up for the intersection is expected to be completed in January, 1985. Both the intersections of Santa Rita Road/Stoneridge Drive and West Las Positas Boulevard/Stoneridge Drive will be modified in the near term when Stoneridge Drive is extended, and the monitoring set-up ~ill be installed with those modifications. Signals at Santa Rita Road/Pimlico Drive are under partial jurisdiction of the State, and the current signal controller at the intersection (Caltrans Type 170) is not compatible with the Multisonics VMS-220 system. A new Multisonics 870 controller could be installed to replace the existing controller, if the 870 controllers work well for the upcoming signals at the Hopyard Road/I-580 interchange. The signals at Stoneridge Drive/Springdale Avenue will not be connected with the system master until the interconnect over the Stoneridge overpass is completed. Upgrading of the signals at Stoneridge Drive/Springdale Avenue will be done as part of the planned improvements for Stoneridge Drive west of 1-680. The loop modification at the intersection of Foothill and Canyon has already been completed in anticipation of a City prb'ject to connect this intersection with the master in the near future. Counting Method Additional vehicle sensor units, detector lead-in cables, and ~ ( .supplemental intersection control units ISICU's)are required in '. order to count separate turning movements at an intersection. The use of a separate set of detector loop and vehicle sensor for each traffic lane used by the major ("critical") traffic movements can produce independent counting of vehicles in adjacent lanes and, hence, achieve dependable counting accuracy. It should be noted that the counting set-up would not produce counts of traffic movements other than the "critical" ones. Supplemental intersection control units are needed because the number of separate sampling detectors a current signal controller can handle is generally limited to 8, which is insufficient for counting vehicle turning movements at some major cross intersections. An SICU alone can accommodate up to 16 sampling detectors. A total of 23 SICU's are needed for the 33 recommended locations. Required hardware for monitoring should be installed with the upgrading of existing signal installations or with the construction of future signal installations. The amount of additional hardware required at the nine intersections recommended for immediate action are: 110 Vehicle sensor units, 9 SICU's, and 31,800 Feet of additional detector lead-in cable and rewiring of 110 Existing detector loops to connect to new sensors. (