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T400 Controller Facilities Manual

667/EB/20200/000 Page 14-1 Issue 9

14. ALTERNATIVE SIGNAL SEQUENCES AND FLASHING SIGNALS

14.1 ALTERNATIVE SIGNAL SEQUENCES

To change signal sequences requires changes in the controllers database values not

accessible to users, such changes are performed by the Traffic Engineering Department

of Siemens. Requirements of signal sequences must be clearly stated in tender

documents, and any subsequent customer orders.

As the Siemens Controller configuring system (Configurator) is developed, fixed

sequence options may be built in and these will be defined in the Configurator

handbook and ‘Customer Specification Forms’.

Traffic Phases

Some examples of alternative signal sequences are:

at no ROW: RED RED

changing to ROW: RED RED

at ROW: GREEN GREEN

changing to no ROW: AMBER GREEN/AMBER

In both examples, the omission of RED/AMBER for “changing to ROW” does not

affect the length of the intergreen.

In the second example, the GREEN/AMBER would normally be the same value as

AMBER LEAVING, i.e. 3 seconds.

The RED/AMBER and AMBER LEAVING periods in the standard signal sequence is

fixed at 2 seconds and 3 seconds respectively in order to conform with Department

Transport Specifications. These values may be changed in order to meet other

specifications if required. For example, it is possible to specify a variable amber leaving

time in a similar way to specifying pedestrian blackout times (see the LAT handset

command).

Pedestrian Phases

The standard signal sequence for pedestrian phases does not allow for “changing to

right-of-way” and “changing to no right-of-way”. The power supply that drives amber

signals on traffic phases is utilised to drive the wait indicator on a pedestrian phase.

An example of an alternative signal sequence is:

at no ROW: RED MAN

at ROW: GREEN MAN

changing to no ROW: AMBER MAN

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Siemens EH.75M.11. Especificaciones Pagina 136