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Only heavy goods vehicles need to idle after startup or they cannot move until the air brake reservoirs are full

180px-leyland_t45_roadtrain_tractor_unit_1988Normally the time allowed for idling is for startup of diesel heavy goods vehicles after the engine has been switched off then restarted. They cannot move until the airbrakes have sufficient pressure to release the handbrake. Small goods vehicles and cars do not have such a necessity. Also overseas legislation has to contend with sub zero temperatures which does not apply
in Hong Kong.

Read the PDF here.

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