Queen's Birthday weekend has seen a drop in the overall number of crashes, with police trumpeting their zero tolerance approach to speeding as a factor.

The first person to be killed on the roads this holiday weekend was "a good mummy who loved her kids".

A holiday weekend crackdown on speeding may be extended across the year after a big drop in accidents, with one fatality so far.

Two cars belonging to one person have made almost 700 trips on the Northern Gateway motorway without paying the $2-a-trip toll - and the owner now faces fines of more than $26,000 if the fees are not paid.

Five police officers have been charged with drink-driving in the past 12 months - including a senior constable working in an Auckland serious crash unit.

NZers favour reducing the amount drivers can legally drink before getting behind the wheel, with 70 per cent supporting a limit of 50mg of alcohol per 100ml of blood, a survey finds.

Male motorists take more risks than women at drink-driving and speeding, an AA Insurance survey has found.

A senior Queenstown police officer is facing a code of conduct inquiry after being caught speeding in the Kawarau Gorge.