Taking the Minister's reply, if a vehicle is stationary and the engine is switched off, whether the intention is to be there for several minutes or just a minute or two, an traffic offence cannot be being committed. I am persuaded by the comments made by the hon. Member for Caithness, Sutherland and Easter Ross. I do not see that the time, or the fact that one is in a long queue, is actually relevant. The lack of power and lack of movement of the vehicle is what is relevant.