Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 83 of 265
6.2.2 Pedestrian Phase
A pedestrian phase controls pedestrian movements via a 2-aspect signal comprising
red and green man plus a WAIT indicator normally driven from the amber aspect.
The standard signal sequence is as follows:
at no ROW - RED MAN
at ROW - GREEN MAN
changing to no ROW
- BLACKOUT
at no ROW - RED MAN
Alternative signal sequences, e.g. RED MAN - GREEN MAN - AMBER MAN, or RED
MAN - GREEN MAN - FLASHING GREEN MAN, or others may be obtained if
required. Also see Section 6.11
The WAIT indicator uses the amber aspect drive (if not used for anything else, see
section 6.2.6.2 and is illuminated when a demand is inserted for the pedestrian
phase from a pedestrian push-button unit. It will normally remain illuminated until the
pedestrian phase gains ROW when it will be extinguished. However it can be
extinguished earlier and the pedestrian demand cancelled when kerbside detectors
are fitted, see section 7.4. During the green man period, demands for the pedestrian
phase are disregarded but they will be accepted during the blackout period and thus
illuminate the WAIT indicator.
A pedestrian phase green is not extendible. However, if it appears in the same stage
as a traffic or green arrow phase and they are extended, the pedestrian phase will
normally be held at green.
The pedestrian clearance period, which may be configured as ‘red’ rather than
‘black-out’, can be extended by the use of ‘on-crossing detectors’, see section 6.5.4.
6.2.2.1 Audible and Tactile Indications (Low Voltage)
It is possible to have an audible indication when a pedestrian phase is at green, if
required. This may be sounded for the entire period of green or just for a minimum
period.
The audible units fit into the pedestrian push-button / wait indicator box. Up to two
may be fitted to give an alternative of loud for daytime use and soft for night time,
switched by the master time clock operating an I/O output.
Alternatively, or in addition to audible units, tactile units may be fitted. These are
also mounted in the pedestrian push-button / wait indicator box, but with a cone-
shaped rotating shaft protruding from the bottom of the box. This rotates when the
pedestrian phase is at green.
For the required equipment, see section 2.11.5 (or 3.14.8 for ELV).