Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 102 of 265
However, if the configured inter-green time to one vehicle phase on an intersection
is increased to say seven seconds (VEH2), it controls the actual inter-green time
and thus delays the vehicle phase by an extra one second. Note that the vehicle is
always delayed by one second, regardless of how long the extendable period
actually runs for, and so always appears one second later than the other vehicle
phase.
6.11.4 Vehicle to Pedestrian Inter-green
All the pedestrian lamp sequences include the Pedestrian All-Red (PAR) period in
their gaining right of way steps, although its effect depends on whether the
pedestrian phase is assigned to an intersection or stand-alone pedestrian stream.
The examples below show the vehicle to pedestrian inter-green period for a stand-
alone pedestrian stream (where the IGN inter-green is set to zero) and for a
pedestrian phase on an intersection (where the IGN command determines the inter-
green period and the PAR value is ignored):
PAR
3
PED:
VEH:
Intersection Pedestrian PhaseStand-Alone Pedestrian Stream
AMBER
RED
GREEN
(IGN:0)
GREEN
RED
3
AMBER
RED
GREEN
IGN:5
GREEN
RED
PED:
VEH:
(PAR ignored)
Figure 19 – Vehicle to Pedestrian Intergreen
6.11.4.1 Intersection Stream
If the phase is running as part of an intersection, the PAR lamp sequence step is
ignored and the vehicle to pedestrian inter-green is controlled solely by the IGN
handset command as normal for intersection phases.
6.11.4.2 Stand-Alone Pedestrian Stream
On a stand-alone pedestrian stream, the IGN inter-green time is still executed,
however, it will have no effect since it is set to zero. Also note that the IGN inter-
green time cannot be changed using the handset on a stand-alone pedestrian
stream.
The PAR sequence waits until the stream is at all red, i.e. until the vehicle phase
reaches red, before beginning its timings.
For each stream, up to five different PAR times can be configured, one for each
termination conditioning. There is one time for when the vehicle phase terminates
on a ‘gap change’ in VA mode (see section 6.5.2) and one for when it terminates on
a ‘max change’ (see section 6.5.3). Different times can also be defined for fixed