Removal of stationary vehicles
8. The driver of a vehicle shall not allow it to stop or to remain at rest in any part of the crossing, other than in a designated parking area, or on the approach roads except—
(a)when directed to do so by a constable or traffic officer;
(b)to enable payment of a toll or charge;
(c)when prevented from proceeding by traffic or other obstruction of the highway;
(d)by reason of breakdown; or
(e)when he is incapacitated by reason of illness.