That measure would be much easier to implement than one in which the police would be involved, because it concerns a contractual matter that would come under the civil law and could be acted on quite quickly.Another possibility is the idea of having mobile 20mph limits. I am not certain whether that is within the powers of the Scottish Parliament and local authorities, but I believe that it would be possible to require, through regulations, school buses to have a flashing 20mph limit sign on the back that would come on when they stopped.