Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 100 of 265
6.11.3 Near Side Pedestrian Crossing
This type of crossing can be used at both intersections and at stand-alone
pedestrian crossings (also known as ‘mid-block’ crossings). The pedestrian signals
are mounted on the ‘near side’ of the crossing, i.e. on the same side of the road as
the pedestrian. When the pedestrian green finishes, these signals immediately show
red, even though a clearance period still delays the appearance of any conflicting
vehicle phases.
On-crossing detectors (see section 7.3.4) may be added to these crossings to give a
variable clearance period, i.e. a longer clearance period while pedestrians are still
crossing.
The vehicle to pedestrian inter-green on a stand-alone crossing is again controlled
by PAR, however if the near-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 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
MIN
Amber
PAR PBT3 2CDY0
Red
Green
Red R/A
Green
Green
RedPed:
Max Change
Gap ChangeOn-Crossing Detector:
Veh:
IPX
2CDY1CMX
R/A
Green
Amber
Green
Red
Red
Green
Red
MINPAR PBT3
Veh:
Ped:
On-Crossing Detector:
Figure 17 – Pedestrian Near Side Sequence
On intersections, the appearance of the vehicle phase may be delayed further if the
IGN inter-green time is larger than PBT plus the red/amber period, see overleaf…