For article 3(4), there shall be substituted the following—
(4) References in section 164(1), (2) and (6) of the Road Traffic Act 1988 to a constable or police constable shall include references to a traffic warden only where—
(a) the traffic warden has reasonable cause to believe that there has been committed an offence by causing a vehicle, or any part of it, to stop in contravention of regulations made under section 25 of the Road Traffic Regulation Act 1984 or an offence in contravention of section 22 of the Road Traffic Act 1988 (leaving vehicles in dangerous positions); or
(b) the traffic warden is employed to perform functions in connection with the custody of vehicles removed from a road or land in the open air in pursuance of regulations made under section 99 of the Road Traffic Regulation Act 1984 or from a parking place in pursuance of a street parking place order, and he has reasonable cause to believe that there has been committed an offence in respect of a vehicle by its obstructing a road, or waiting, or being left or parked, or being loaded or unloaded, in a road.