Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 98 of 265
The vehicle to pedestrian inter-green on a stand-alone crossing is again controlled
by PAR, however if the far-sided pedestrian phase is part of an intersection stream,
this period is controlled by the IGN inter-green command. See section 6.11.4 for
more information on the vehicle to pedestrian inter-green.
The pedestrian to vehicle blackout clearance period consists of:
 a minimum period governed by PBT p,
 an extendable period limited to a maximum governed by CMX p,
 a gap clearance delay CDY p 0*, or
 a max clearance delay CDY p 1 where ‘p’ is the pedestrian phase letter
Following this blackout clearance period, there is a clearance all-red period CRD p.
* The gap clearance delay CDY p 0 is usually set to zero and hence is not shown on
the following diagram.
MIN
Amber
PAR PBT3 2
CRD
CRD
Red
Green
Red R/A
Green
BlackoutGreen
RedPed:
Max Change
Gap ChangeOn-Crossing Detector:
Veh:
IPX
2CDY1CMX
R/A
Green
Red
MIN
Amber
PAR PBT3
Green
Red
BlackoutGreen
RedPed:
Veh:
On-Crossing Detector:
Figure 16 – Pedestrian Far Side Sequence
If a fixed blackout period is required, i.e. with no on-crossing detectors, CMX should
be set to zero so that the blackout period is controlled solely by PBT, see section
6.11.5.
On intersections, the appearance of the vehicle phase may be delayed further by
the IGN inter-green time, see overleaf for details.
Note that for non UK controllers, the blackout clearance period can be configured as
flashing green for example.