Police are urging motorists to go easy on the drink for the remainder of the long weekend, with alcohol believed to be a significant factor in six of seven road deaths so far.

The fatalities include four male farm workers who were killed in a crash in northern Hawke's Bay after drinking at a local hotel.

The alarm was raised around 7.30am on Sunday by a passing motorist who saw a Mitsubishi Pajero over a bank on Waikare Road just off State Highway 2 near Putorino, 60 kilometres north of Napier.

The four men aged 47, 64, 42 and 48 all lived in the area and were working as farm hands, Senior Sergeant Sarah Stewart said.

Three of them were thrown from vehicle and it is not yet known if anyone was wearing seatbelts.

The driver lost control of the vehicle on a slight crest on an unsealed road. The car slid across the road, flipped, crashed through a fence and landed on its wheels in the paddock.

Police are still trying to work out when the crash happened.

Earlier a male pedestrian died at Lincoln near Christchurch and a woman pedestrian was killed when she was hit by a car around 6pm on Saturday at Otane, 37km southwest of Hastings.

A man in his 20s died on Saturday night after his car rolled and hit a pole in Stratford, Taranaki.

Acting National Road Policing Manager Superintendent Rob Morgan says alcohol is thought to have been involved in three of the four crashes.

"We are extremely saddened by this loss of life and we're urging people not to drink and drive. Personal responsibility is the key to staying as safe as possible on the roads," he said.

"We'll say it again - if you are going to be drinking, don't drive. If you're with friends, nominate one of your group to be the sober driver."

Last year one person died in the corresponding holiday weekend.

Easter 2012 became the first holiday weekend in living memory where there were no fatalities.