(a) No person shall operate a vehicle towing another motor vehicle upon a freeway unless the towing vehicle is coupled to the towed vehicle by a rigid structure attached securely to both vehicles by nonrigid means.
(b) The requirements of subdivision (a) are not applicable to a vehicle towing a motor vehicle which has been disabled and is being towed from the point of disablement to the nearest and most accessible exit from the freeway.
(Added by Stats. 1970, Ch. 334.)