Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 114)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-54 Issue 9

Figure 9.8 - EXAMPLE OF VA STAGE CHANGES

STAGE 2

STAGE 1

STAGE 3 STAGE 4

‘I’

9.10.1 Arterial Reversion

After a phase has gained ROW, if there are no other demands then ROW will remain

on that phase. The arterial reversion facility allows ROW to revert to a specified stage

or phase in the absence of any demands and extensions, subject to any minimum green

periods timing off and any stage movement restrictions.

If a stage is specified, then the reversion will always be to that stage, but if a phase is

specified, then reversion will be to the next stage in cyclic order in which that phase

appears.

If ROW is on a phase that is extending with no other demands or extensions and that

phase appears in the arterial stage or appears in another stage with the arterial phase,

then a change to that stage will take place.

The name of the facility is derived from its normal use, which is for intersections with a

main (or arterial) movement. During quiet periods, especially at night, ROW will revert

to the main movement after a side road has had ROW, so that isolated vehicles on the

main movement will not have to demand ROW and then wait for an intergreen period

from the side road to time off. In this case, a stage would normally be specified for

reversion.

Another use of the facility is on bridges with shuttle working. If the all-red movement

is reverted to then isolated vehicles from either direction would only have to wait for a

red/amber period before gaining ROW. If more than one all-red stage is used with the

same dummy phase in each stage, then this phase would be specified for reversion

allowing the next all-red stage in cyclic order to become active.

Figure 21.5 indicates where to specify the required stage or phase.

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Siemens EH.75M.11. Especificaciones Pagina 114