Senior Sergeant Chris Brooks said police had started the month with several road operations on major tourist routes, including the Cardrona Valley Highway and the Haast and Lindis passes.
Vehicles not remaining in their lane was one of the most common displays of dangerous driving officers encountered among visiting drivers, especially on bendy sections of road such as the Crown Range.
"Some of them don’t even realise they’re doing it and others say ‘in our country we’re allowed to straighten the roads’."
Their focus had been on education above issuing infringement notices and officers had engaged in "pretty good conversations" with those at fault.
Local drivers could play their part by following the road rules and setting a good example for others to follow, he said.
A single-vehicle crash on Lake Hāwea’s Domain Rd on Waitangi Day was caused by a sudden transition from seal to gravel.
The vehicle’s sole occupant had been on their way to Wānaka when they lost control on the gravel, causing the car to flip on to its roof.
Police and fire crews attended the scene, and the driver received minor injuries.
Snr Sgt Brooks said the incident was a reminder for people to drive to the conditions at all times.