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If no conflicting call is present at a permissive sync point, the <br />controller shall dwell in the sync phase until the next permissive <br />period occurs. <br />If there is a conflicting call present during the sync phase <br />permissive period, the sync phase shall yield and answer all phases <br />with calls in sequence, returning to the sync phase no later than <br />the beginning of sync phase background cycle. If termination on <br />another phase occurs, it shall be possible to reenter the sync <br />phase early. Once the sync phase is reentered, it shall not yield <br />again until the next permissive period unless preferred service has <br />been assigned to a conflicting phase. <br />(2) Local Split Selection. It shall be possible to override a <br />su system se ect sp ~ ratio on the basis of local pedestrian <br />demand and/or vehicle sensor information. A Calculation Routine <br />number shall be used to determine the split ratio. If a local <br />split ratio cannot be determined, the subsystem selected split <br />ratio will govern. The local split selection feature shall not be <br />effective for any intersection operating in the free mode. <br />(3) Offsets. It shall be possible to program at least 6 offsets as a <br />percentage of the subsystem cycle length in a range from 0 through <br />99 percent in 1 percent increments. <br />(4) Splits. At least 5 split levels (ratios) shall be selectable for <br />eachintersection. It shall be possible to program the split <br />percentages for each phase in the intersection. If a calculation <br />routine is used for local split selection, the operator may progran <br />the calculation routine output range in which each split level <br />shall be effective. <br />(5) Coordinated Minimum. It shall be possible to program a minimum <br />green interva or each phase. This will insure that a phase will <br />not be serviced for a time shorter than a pedestrian interval or a <br />minimum initial interval. <br />(6) Preferred (Conditional) Service. If preferred or conditional <br />service is se ec or a p ase, hat phase shall be reserviced i n <br />a cycle upon demand after the sync phase has been reentered and has <br />gaped out. To obtain reservice, there must be enough time before <br />the sync point is reached to complete servicing the preferred phase <br />for_ a minimum time. If there i s a waiting pedestrian call for the <br />preferred service phase, there must be enough time before the sync <br />point is reached to complete timing the "Pedestrian Period". Only <br />one phase (or 2 concurrently timed phases) shall be selected for <br />preferred service at an intersection signal. <br />(7) Pedestrian Movements shall be serviced as determined by the local <br />contro er on y ~f a pedestrian demand actuation has been <br />registered prior to its associated vehicle phase. <br />-8- <br />