Strange rules of the road

"The current Highway Code was updated in 2007 to take into account the rigours of modern driving - traffic gridlock, environmental awareness and increasing reliance on modern technology.
It means the ever-present book, which reportedly still sells around one million copies per year, is an unusual mix of old and new. Here are a few of the stranger things you'll read in the Highway Code.

Rule: Mobility scooters must not travel faster than 4mph
The Code stipulates that powered wheelchairs must not exceed 4mph on pavements - about walking pace for the average man. So, if you're overtaken by a sweet old lady in a wheelchair or mobility scooter, she's probably breaking the law. There's every chance her vehicle is a Class 3 - in which case its 8mph top speed means it should be driving on the road, according to the Code. Tell her to hit the highway!

Rule: Keep sheep under control at all times
Yes, the section for animal herding remains. Law 58 requests that the law-abiding animal herder send a friend along the road in front of him, whose specific job it is to warn people there's some herding going on. This is particularly true when approaching a bend or on the brow of a hill, says the Code.

Rule: Circle your arm to turn left
Arm signals are covered for occasions when your indicators aren't working, though only three remain. A straight arm out means you're turning right, but circle that arm anti-clockwise and you're turning left. Flap it up and down when you want to stop. Funnily enough there's no recommended hand gesture for 'that was some inconsiderate driving there, sir.'

Rule: Look after the environment
Stopping for more than 'a couple of minutes'? Then switch the engine off to reduce emissions and noise pollution, says the Code. It is legal to keep the engine running when faults are being diagnosed (assuming you're not there because you've conked out) but if you're just running the engine to keep the car warm, forget it - the ozone layer is more important than the possibility of you catching a cold, OK?"