Specifications

Adjusting the timers
Look at the selection switches, or menu display/keypad, for the All-Red and Maximum Green timers
for each approach. This should make it clear whether to measure the distance between:
• the two ‘WAIT HERE’ signs – at sites with more than two approaches, the longest distance to the
other ‘WAIT HERE’ signs is used for that approach – or
• the ‘WAIT HERE’ sign and the ‘datum’ point. The datum point can be half way along the shuttle
working length, or a point in the centre of the junction (see page 8).
It is important to watch the vehicular flow at intervals and adjust the controller settings if necessary.
As the flow changes during the day and day-to-day, it is necessary to carry out this check several
times daily.
The following tables cover distances up to 300 metres between ‘WAIT HERE’ signs. If the longest
distance is above 300 metres, ask for advice from the relevant traffic authority before proceeding.
NOTE: Some authorities will need to be informed if the distance is over 200 metres. You, or your
supervisor, should check if in doubt.
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