BUYERS of new, motorised child-type scooters - known as gopeds - could land themselves in trouble.
Police say many riders seemed not to know the vehicles needed insuring.
And in the case of petrol-driven machines, helmets and licences are necessary.
Calderdale Council has received complaints about the reckless use of gopeds.
Peter Shepherdson, the council's road safety officer, said: "When driven along the pavement they are a danger to anyone not able to leap out of the way.
"If a pedestrian was hit by one it could easily result in them receiving a broken leg, or worse.
"If the rider is not insured, they could be sued for tens of thousands of pounds."
Police sergeant Gerry Alderson said: "These vehicles are sold openly to people who do not realise that if they just take them on the road they will be committing a host of offences."