How about cars not allowed in outside lane when it's one-way? There's few things more annoying than the Ford Capri's with sheepskin seat covers (or whatever the modern equivalent is) doing out-braking manoeuvres on the Mountain.

Actually, a blast over the Mountain on other evenings, when it's quiet, is a lot more fun. Unless you really need to be looked at by the spectators. In which case, maybe you should be racing.