Rule 107
Driver and Vehicle Standards Agency officers have the power to stop vehicles on all roads, including motorways and trunk roads. They will attract your attention by flashing amber lights either from the front requesting you to follow them to a safe place to stop or from behind directing you to pull over to the side by pointing and/or using the left indicator. It is an offence not to comply with their directions. You MUST obey any signals given (see ‘ Signals by authorised persons ’). Laws RTA 1988 sect 67 , & PRA sect 41 & sched 5(8)