15
Operation
Making adjustments
When the system is running, continue to monitor the build up of
traffic on each approach. If regular patterns of significant traffic
queues are emerging on particular approaches, consider making
careful adjustments to alleviate the problem.
Timing adjustments can be made to a phase at any time. The
effects of timing changes will be incorporated during the next full
cycle of operation for each phase.
Note
Introduce timing changes in small steps and one at a time.
Observe the results before making any further changes.
Slow moving vehicles not clearing the works
If there are large numbers of slow moving vehicles which have
difficulty in clearing the works before the signals have changed,
increase the
ALL RED
settings for the affected approach(es) in
small steps.
1
Ensure that the
ALL RED
indicator is on.
If it is not, press the
MAX GRN
ALL RED
button located in the centre of the panel.
2
Press the phase timing button for the
phase that needs to be adjusted to
increase the ALL RED time.
3
Allow several full vehicle cycles to occur and observe the
changes to traffic behaviour.
4
Repeat if necessary.
Vehicles taking more than one green period
to clear the works
If substantial queues begin to form and vehicles regularly take
more than one green period to get through the works, increase
the
MAXIMUM GREEN
settings for the affected approach(es) in
small steps.
1
Ensure that the
MAX GRN
indicator is on.
If it is not, press the
MAX GRN
ALL RED
button
located in the centre of the panel.
2
Press the phase timing button for the
phase that needs to be adjusted to
increase the MAX GRN time.
3
Allow several full vehicle cycles to occur and observe the
changes to traffic behaviour.
4
Repeat if necessary.
