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| SFMTA home > Traffic > Construction > Blue Book > Section 11: Detector Loops at Intersections | |||
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Section 11: Detector Loops at Intersections 11.1 Loop Detectors DPT maintains vehicular detector loops at certain signalized intersections. Detector loops are usually marked with square or circular saw-cuts in the pavement, just before the crosswalk line. The loops are usually located within the first four inches of the roadway surface. These loops communicate with the traffic signal controller and determine the amount of time a certain movement receives a green light. If the loops are functioning properly, the traffic signals are set to minimize the overall wait time for drivers. If they are not, drivers will tend to stop unnecessarily in some locations or wait longer at others. This results in increased vehicle idling, stop-and-go pollution and frustration among the driving public. 11.2 Loop Detectors in the Work Area The Contractor is responsible for making sure that these facilities are not damaged. If these loops are within the work area and could be damaged or affected, Contractor should follow the procedure below: A. Contractor shall notify DPT signal shop at 415-550-2736, 48 hours before starting work. B. Contractor shall obtain a copy of the loop detector plan from DPT at 415-701-4500. C. Contractor shall repair and restore the loops, at his expense, within seven days of roadway restoration at the site. D. Contractor shall notify the DPT signal shop as soon as the loop is re-installed for inspection. 11.3 Other Traffic-Related Devices on the Pavement In addition to having vehicle loop detectors for signals, some intersections in the City have red light cameras or in-pavement flashing devices. The Contractor should follow the procedures described in Section 11.2 “Loop Detectors in the Work Area” when encountering these conditions. Explore: |
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