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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 /> <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 /> <br />(2) Local Split Selection. It shall be possible to override a <br /> subsystem selected split 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 /> <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 I percent increments. <br /> <br />(4) Splits. At least 5 split levels (ratios) shall be selectable for <br /> e~Ch' i'ntersection. 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 prograD <br /> the calculation routine output range in which each split level <br /> shal 1 be effective. <br /> <br />(5) Coordinated Minimum. It shall be possible to program a minimum <br /> green in(erval"""for 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 /> <br />(6) Preferred (Conditional) Service. If preferred or conditional <br /> sirvice is selected ~or a phase, that phase shall be reserviced in <br /> a cycle upon demand after the sync phase has been reentered and has <br /> ga{)ped 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 is a waiting pedestrian call for the <br /> pre. ferred service phase, there must be enough time before the sync <br /> point is reached to complete timing the "Pedestrian Period". 0nly <br /> one phase (or 2 concurrently timed phases) shall be selected for <br /> preferred service at an intersection signal. <br /> <br />(7) Pedestrian Movements shall be serviced as determined by the local <br /> contr6ller only if a pedestrian demand actuation has been <br /> registered prior to its associated vehicle phase. <br /> <br /> -8- <br /> <br /> <br />