SINGLE CARRIAGEWAY – THREE-VEHICLE WORKING
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1. Initially the signs at both ends are on “STOP”. The convoy escort vehicles are labelled A, B and C.
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2. The sign in front of B is switched to "GO" and B then sets off leading traffic past the works at a speed of 10 mph.
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3. Driver A radios the sign operator to switch to "all-stop" as he approaches the sign and stops in front of it to prevent following vehicles passing the sign on “STOP”.
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4. Vehicle B continues to lead the following traffic at not more than 10 mph until well clear of the works, thus ensuring that vehicles at the back of the convoy are still travelling at 10 mph.
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5. Driver C radios the sign operator when the last vehicle of the convoy has cleared the works to change his sign to "GO". Driver B turns around and joins the queue.
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6. Driver C sets off leading traffic past the works at a speed of 10 mph. Driver B radios the sign operator to switch to "all-stop" as he/she approaches the sign. Depending on the length of the queue, convoy vehicle B may need to enter the queue part way along its length to limit the length of the convoy past the works.
This process is then repeated from Step 2 above, but from the opposite direction and so on.
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