Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 97 of 265
6.11.1 UK ‘Pelican’ Crossing
A UK ‘Pelican’ crossing is a stand-alone pedestrian stream containing one vehicle
and one pedestrian phase. The vehicle phase may control the signals of one or
more vehicle approaches.
The signals normally reside at vehicle green and pedestrian red. The controller
responds to pedestrian push-button demands that cause the vehicle phase to move
to red and the pedestrian phase to appear at green.
The vehicle to pedestrian inter-green is always controlled by the PAR Pedestrian
All-Red period since ‘Pelican’ crossings are only available on stand-alone
pedestrian streams. See section 6.11.4 for more information on the PAR time.
When pedestrian phase has been at steady green for its configured period (MIN),
the green flashes for a configured period before returning to red. During the flashing
green period, the vehicle phase moves from red to flashing amber. This is the fixed
clearance period of the ‘Pelican’ crossing.
The pedestrian to vehicle inter-green is divided into three periods governed by the
PIT Pelican Inter-green Times.
MIN
Amber Flashing Amber
PAR PIT n 1 PIT n 2PIT n 03
Red
Green
Red
Green
Flashing GreenGreen
RedPed:
Veh:
(where ‘n’ is the stream number)
Figure 15 – Pelican Sequence
Note that it is common for the durations of the first (PIT n 0) and last periods (PIT n
2) to be set to zero. In this case the signals appear at flashing green / flashing
amber for a fixed period (PIT n 1) between the pedestrian phase green and the
vehicle phase green.
6.11.2 Far 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 still mounted on the far side of the crossing so the pedestrians look across the
road to see their red and green signals.
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, but also see section 6.11.5 for a “Fixed Clearance Period”.