A motorist was caught doing 164km/h while more than four times the legal breath limit on Saturday.
Senior Constable Andy Williamson was on his way to a call in Akaroa when he clocked the speeding 40-year-old man on the Christchurch Akaroa Rd near Motukarara at about 5pm.
The man was doing 172km/h moments before Williamson recorded the speed.
When the Christchurch man got out of his Volkswagen Golf, Williamson noticed the smell of alcohol.
He recorded a breath alcohol reading of 1025mcg/l.