Buses Prohibited Post Mount Sign - Dia. 952 R2/RA2 (Face Only)The no buses sign restricts buses from accessing a road. This includes all vehicles designed to carry 8 or more passengers. Diagram 952 may be seen in country lanes where the road may be too narrow or where buses would cause issues and obstruct local residents. Exceptions to the prohibition can be made clear using a supplementary sign: Except local buses for where it marks a local bus route such as a shortcut to a local tourist destination Except