Should speed vans be visible at all times? Will driver's receive a ticket if they exceed the limit by less than 10%? And is it illegal to flash your headlights to alert motorists of a speed van ahead?
These are just some of the common questions about mobile speed camera vans which have been answered by Gareth Thomas, who mans a GoSafe speed van as a casualty reduction officer. North Wales Live spent the day with the expert to separate some of the facts from the fiction that circulates among some motorists.
The former North Wales Police officer told their reporter exactly how speed cameras work, the truth behind some of the most popular myths and claims and - and how you can avoid being caught speeding.
