No vehicle shall stop, stand, or be parked in or upon any vehicular crossing except:
(a) When necessary to avoid injury or damage to persons or property.
(b) When necessary for the repair, maintenance or operation of a publicly owned toll bridge.
(c) In compliance with the direction of a member of the California Highway Patrol or an employee of the Department of Transportation who is a peace officer or with the direction of a sign or signal.
(d) In such places as may be designated by the Director of Transportation.