Siemens EH.75M.11. Spezifikationen PDF herunterladen (Seite 81)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-21 Issue 9

9.4.2 Operational Description

9.4.2(a) General

Under no circumstances will the introduction or cancellation of priority facilities

override the normal minimum green period, intergreen periods (including pedestrian

blackout periods) or any enforced stage sequences specified for safety or other

reasons. A priority demand will result in each phase in such a sequence running for its

minimum period.

The priority extension priority maximum running period and priority change facilities

will be provided for emergency vehicles. Inhibit and compensation periods are not

required for emergency vehicle priorities.

The duration of the priority extension and priority maximum periods at the bus priority

level, may not necessarily be of the same duration as those specified for the emergency

vehicle priority level.

The range of priority facilities specified for a given signal phase at a particular priority

level, need not be duplicated at the other priority level, nor need priority demands and

priority extensions at one level apply to the same phase.

An operation of the priority vehicle detection equipment whilst the priority phase does

not have right of way will, in addition to registering as priority demand, register as a

normal demand. If the phase is normally called by a call/cancel unit, a latching demand

may still be registered.

Provision is made for the full range of priority facilities for buses, but the inclusion of

certain facilities is optional and some facilities are interdependent.

The minimum facilities for buses are priority extension and priority maximum running

period.

Priority change may be added. An on/off control may be specified to include or

exclude this facility.

An inhibit period may be added.

Compensation period(s) for phases curtailed or omitted may be added.

Priority facilities for emergency vehicles and for buses will only need to be provided on

a maximum of two phases for each priority level at a junction. The priority phases for

emergency vehicles need not be the same as the priority phases for buses.

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 307 308

Keine Kommentare

Siemens EH.75M.11. Spezifikationen Seite 81