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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 (durtng which local intersections <br /> continue to operate interconnected on the basis of the last <br /> coordination information transmitted by the master). <br /> <br /> (2) Error Detection. The operating system shall continually monitor <br /> data 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 mallunctions and/or interruptions: <br /> <br /> a.If any intersection in the system goes on flash for any reason; <br /> reason for going on flash shall be recorded. <br /> <br /> b. Loss of communication with the local intersection. <br /> <br /> c. Failure of a local intersection to respond to master convnands. <br /> <br /> d.Local intersection timing is in conflict with that called for <br /> i n the master. <br /> <br /> e. Computer power is removed and subsequently returned. <br /> f. An intersection is preempted. <br /> g. An intersection goes into conflict. <br /> <br /> h. An intersection returns to the on-line mode from any of the <br /> conditions above. <br /> <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 action shall be logged. If the detector returns to normal <br /> operation, it shall be placed back in service and this factor <br /> shal 1 al so~-be 1 ogged. <br /> <br />(3) Volume Data Collection. Detector monitoring routines shall be <br /> capable of obtaining' traffic data from any intersection and/or <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 /> <br /> a. Spot Volume Monitoring -- Up to 12 selectable detectors shall <br /> be monitored continuously for a progranmnable 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 /> t nc remen t. <br /> <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 /> <br /> <br />