(1) No person shall drive any motor vehicle at a speed exceeding 50 miles per hour on a restricted carriageway.
(2) Each of the following is a restricted carriageway—
(a) the northbound carriageway of the Kearsley Spur between its junction with the northbound exit slip road (marker post 3.8) and its junction with the A666 (Farnworth and Kearsley bypass) (marker post 4.4);
(b) the northbound exit slip road between its junction with the northbound carriageway of the Kearsley Spur and its junction with the Kearsley roundabout (Bolton Road).
(3) For the purposes of this regulation the junction between the Kearsley Spur and the northbound exit slip road shall be taken to be marked by a gantry over the carriageway on which there are for the time being displayed traffic signs of the size, colour and type shown in diagram 670 of the Traffic Signs Regulations and General Directions 1994 varied to indicate a speed limit of 50 miles per hour.