See this other post of mine.Just to complicate matters a bit more... I seem to recall some provision in the EU law which DOES allow the throttle to be used independent of pedalling, but ONLY to 6km/h? if the user is PUSHING the bike, not riding it?
Someone correct me if I'm wrong. So technically, you could argue (in court/law) that a bike which has a throttle fitted which is designed to work independent of pedalling is NOT illegal in itself? If the user obeys the law and only uses it as above.. heh. What you do on the road out of sight of the local law enforcement, is another matter.
The walk-alongside law is specific and clear, it in no way applies to other circumstances and is based on the Pedestrian Controlled Vehicle Regulations in both Europe and Britain. The maximum speeds are stated in those laws, 6 kph EU and 4 mph Britain.