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the intersections to be assigned to a subsystem. Each Calculation Routine shall compute the volume and occupancy from selected detector input. Level Selection Routines shall be associated with the Calculation Routines to assign various programs, based on computed volume or occupancy. Routines which shall be programmable by the operator shall be as follows: (1) Time Interval Routines. It shall be possible for the operator to se ect t s rt a stop time for the day, hour, and minute i n which the Calculation Routine will become effective. Additionally, the operator shall be able to assign up to 2 Calculation Routines to each specific subsystem. As an alternative, it shall be possible to preempt a particular program to control a subsystem based on a selected time of day and day of week. (2) Program functions which can be selected shall include, but not be limited to, cycle change, offset change, split change, coordinated or free operation and transfer control of intersections from one subsystem to another. The routine shall select one of the "daily" programs (or calculation routine) at the beginning of each day. Ten "daily" (or special event) programs shall be available for selection. This information shall be capable of being transmitted over a Bell System grade 3002 leased line between the two master controller locations. Daily programs may be preselected chronologically for 1 days before repeating in sequence. (3) Calculation Routines. It shall be possible to program 128 each 12 etec or a cu a ion Routines. The operator shall be able to select the average, highest, highest average, ratio, or a combination of these calculations of detector outputs, to compute volume and occupancy. Yolume computations shall reflect the true volume in vehicles per hour per lane (V/HR/LN). An adjustable 100 percent level shall be programmable in a range from 0 through 1000 V/HR/LN in 1 Y/HR/LN increments. In occupancy computations, it shall be possible to scale the true occupancy against a preselected 100 percent occupancy level. It shall be possible to select a transition (crossover) point at which the computer occupancy output, rather than the volume, shall become the controlling output of the Calculation Routine. Calculations shall be made after a programmable number of actuations are received or after a programmable time, whichever occurs first. This shall allow the frequency of calculations to be proportional to traffic levels if desired. (4) Level Selection Routines. 128 each Level Selection Routines assign a given su system shall be compared to these levels to select a subsystem programs (Timing Pattern). (5) Timing Pattern Routines. Up to 128 each Timing Patterns shall be ava~ a e. ac imi ng Pattern shal l include a subsystem cycle -10-