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T400 Controller Facilities Manual

667/EB/20200/000 Page 9-20 Issue 9

9.4.1(b) Priority Extension

A continuation of a green signal requested by vehicle(s) equipped to operate the

priority vehicle detection equipment.

The timing range is 0 to 31.8 seconds in 0.2 second steps.

9.4.1(c) Priority Maximum Running Period

A further maximum running period which commences at the expiry of the normal

maximum running period if a priority extension period is running or if a priority vehicle

detector output is present.

The timing range is 0 to 255 seconds in 1 second steps.

9.4.1(d) Priority Demand

A demand for an immediate right of way originating from vehicle(s) equipped to

operate the priority vehicle detection equipment.

9.4.1(e) Revertive Priority Demand

A priority demand entered, at the termination of a priority phase, for the phase being

left.

9.4.1(f) Priority Change

A signal change which occurs as a result of a priority demand (the signal change being

subject to the maximum safety periods and to the priority facilities specified on the

phase which has right of way).

9.4.1(g) Priority Unit

A Priority Unit can be regarded as a Priority Channel. The required phase is allocated

to a Priority Unit. The phase can then be regarded as a Priority Phase. The Priority

facilities, e.g. Priority Timings, or Priority Inhibits are set (via the configuration Prom

or the handset) for each Priority Unit. This in practice then affects the times, etc.

associated with the Priority Phase.

9.4.1(h) Priority Delay

A Priority Delay can be applied to a Priority Input such that, when the Priority Input

goes active, it does not apply a Priority demand on the controller until the Priority

Delay Timer has expired.

9.4.1(i) Inhibit Period

A period following a priority change, during which priority changes originating from

the same priority unit shall not occur, but priority extensions may still be served. The

inhibit period may be considered to have started from either the commencement or end

of the prior stage which was called by a priority demand.

The Priority Inhibit Period may be in the range 0 to 255 seconds in 1 second steps.

9.4.1(j) Compensation Period

An extension of the normal maximum running periods which, following a priority

change may be introduced in nominated signal phases associated with each bus priority

phase other than the phase to which the priority change was made.

The timing range is 0 to 255 seconds in 1 second steps.

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