Police have caught 30 drivers crossing the centre line in a four-hour period on a stretch of South Island highway.
The misbehaving drivers were caught cutting corners in the Hundalee area of State Highway 1, south of Kaikoura, yesterday.
Senior Sergeant Phil Dean said more than one driver every 10 minutes crossed the centre line during the four-hour stretch.
"The majority of the drivers were New Zealand residents and while most of them apologised for their driving behaviour, too many still felt that it was okay to straddle the line on bends," he said.
The Hundalee area has been a focus of centre-line enforcement since 2008, due to a high number of head-on crashes resulting in serious injuries and fatalities.
"The section of SH1 in Hundalee has multiple bends as the road navigates through the hilly terrain," Snr Sgt Dean said.
Crashes on bends or head-on crashes in Hundalee accounted for 79 percent of all crashes in that area, he said.
Drivers can be fined $150 and 20 demerit points for crossing the centre line, and in some cases could be charged with dangerous driving.