DUAL CARRIAGEWAY – MULTIPLE-VEHICLE WORKING
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1. The convoy escort vehicles are labelled A and B. With the signs on "STOP", the convoy vehicle A moves into place at the head of the queue in front of the ". . . WAIT HERE FOR CONVOY VEHICLE" sign (diagram 7027).
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2. The signs are changed to "GO" after a queue of 20–30 vehicles has formed, or not more than five minutes after the first vehicle has arrived, and the convoy vehicle A sets off leading the traffic through the works at a speed of 10 mph or less.
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3. The signs are turned to "STOP" when the last vehicle in the queue has entered the works area. Convoy vehicle B moves into place and the sequence is repeated from Step 1.
Convoy vehicles return to the start by turning at nearby interchanges, by using site accesses, slip roads or the lane closure.
Use of the running lane for this purpose is not recommended as it will increase the cycle time of the system and may adversely affect its capacity and safety.
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