Road Traffic Act 1988

35 Drivers to comply with traffic directions

(1) Where a constable is for the time being engaged in the regulation of traffic in a road, a person driving or propelling a vehicle who neglects or refuses—

(a) to stop the vehicle, or

(b) to make it proceed in, or keep to, a particular line of traffic,

when directed to do so by the constable in the execution of his duty is guilty of an offence.

(2) Where—

(a) a traffic survey of any description is being carried out on or in the vicinity of a road, and

(b) a constable gives to a person driving or propelling a vehicle a direction—

(i) to stop the vehicle,

(ii) to make it proceed in, or keep to, a particular line of traffic, or

(iii) to proceed to a particular point on or near the road on which the vehicle is being driven or propelled,

being a direction given for the purposes of the survey (but not a direction requiring any person to provide any information for the purposes of a traffic survey),

the person is guilty of an offence if he neglects or refuses to comply with the direction.

(3) The power to give such a direction as is referred to in subsection (2) above for the purposes of a traffic survey shall be so exercised as not to cause any unreasonable delay to a person who indicates that he is unwilling to provide any information for the purposes of the survey.