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c. Disconnection of the intersection controllers in the event of <br />computer shutdown allowing them to operate full actuated after <br />a variable time prior (during which local intersections <br />continue to operate interconnected on the basis of the last <br />coordination information transmitted by the master). <br />(2) Error Detection. The operating system shall continually monitor <br />ata transmitted from each local intersection and shall <br />automatically record the type of error detected and the time of day <br />for any of the following nal functions and/or interruptions: <br />a. If any intersection in the system goes on flash for any reason; <br />reason for going on flash shall be recorded. <br />b. Loss of communication with the local intersection. <br />c. Failure of a local intersection to respond to master commands. <br />d. Local intersection tuning is in conflict with that called for <br />in the master. <br />e. Computer power is removed and subsequently returned. <br />f. An intersection is preempted. <br />g. An intersection goes into conflict. <br />h. An intersection returns to the on-line mode from any of the <br />conditions above. <br />i. Failure of a detector. Detector failure shall be determined as <br />follows: All sample detector input shall be compared to a set <br />of anticipated rates from the time and day of the week and to <br />the total lack of detector activity or a locked detector. When <br />a detector error is detected its input shall be ignored and <br />this a~:tion shall be logged. If the detector returns to normal <br />operation, it shall b!e placed back in service and this factor <br />shat l al so~~be 1 ogged. <br />(3) Volume Data Collection. Detector monitoring routines shall be <br />capa e o o tarn ng raffic data from any intersection and/o r <br />surveillance vehicle detectors in the system. In addition to <br />detector failure, monitoring, spot volume monitoring and 24 hour <br />volume monitoring routines shall be provided as follows: _ <br />a. Spot Yolume Monitoring -- Up to 12 selectable detectors shall <br />be monitored continuously for a programmable time increment. ` <br />The number of actuations registered for each detector shall be <br />logged and printed out automatically at the end of the time <br />increment. <br />b. Twenty-Four (24) Hour Volume Monitoring -- Any one set of 3 <br />sets, of 12 selectable detectors each, shall be monitored for a <br />-12- <br />