25.—(1) The requirements conveyed to vehicular traffic on roads by the road marking consisting of the transverse lines shown in diagram 1003 shall be as follows.
(2) Except as provided by paragraphs (3) to (6), the requirement conveyed by the transverse lines shown in diagram 1003, whether or not they are placed in conjunction with the sign shown in diagram 602 or 1023, shall be that no vehicle shall proceed past such one of those lines as is nearer the major road into that road in a manner or at a time likely to endanger the driver of or any passenger in a vehicle on the major road or to cause the driver of such a vehicle to change its speed or course in order to avoid an accident.
(3) Wherever the transverse lines are placed in conjunction with the sign shown in diagram 602, and that sign is at the same time placed in combination with the sign shown in diagram 778 or 778.1 at a level crossing, then the requirement shall be that no vehicle shall proceed past such one of those lines as is nearer the level crossing in a manner or at a time likely to endanger the driver of or any passenger in a railway vehicle or tramcar, or to cause that driver to change the speed of his vehicle in order to avoid an accident.
(4) Wherever the transverse lines are placed in advance of a point in the road where the width of the carriageway narrows significantly, then the requirement shall be that no vehicle shall proceed past such one of those lines as is nearer to the point of narrowing in a manner or at a time likely to endanger the driver of or any passenger in a vehicle that is proceeding in the opposite direction to the first-mentioned vehicle, or to cause the driver of such a vehicle to change its speed or course in order to avoid an accident.
(5) Where the transverse lines are placed in conjunction with the sign shown in diagram 611.1 at a junction marked with the road marking shown in diagram 1003.4, then the requirement shall be that no vehicle shall proceed past such one of those lines as is nearer to the road marking shown in diagram 1003.4 in a manner or at a time likely to endanger the driver of or any passenger in a vehicle circulating past that road marking from the right of the first-mentioned vehicle or to cause the driver of the second-mentioned vehicle to change its speed or course in order to avoid an accident.
(6) Where the transverse lines are placed in advance of a length of the carriageway of the road where a cycle track crosses the road along a route parallel to the transverse lines, then the requirement shall be that no vehicle shall proceed past such one of those lines as is nearer the cycle track, in a manner or at a time likely to endanger any cyclist proceeding along the cycle track or to cause such a cyclist to change speed or course in order to avoid an accident.