Speeding drivers terrorising visitors and 'destroying Eryri's peace and quiet'Calls have been made for 40mph limits and average speed cameras. Mike Byrne said they have turned the national park into a “terrifying” experience for other visitors. Mike, originally from Chester and now living in Betws-y-Coed, believes 40mph limits should be imposed on national park A roads to deter speeding drivers. The national park is for the enjoyment of all but speeding cars and motorbikes have no place. “In recent years there has been a marked increase in the numbers coming to the national park,” he said.