Motorists are driving in excess of 125 km/h on the new Tauranga Eastern Link road and police, who fear someone could be killed, say the road is "not a racetrack".
The stretch of State Highway 2 between Te Maunga and Domain Rd opened in May and since then motorists have been caught driving at excessive speeds.
While the construction was underway the stretch of SH3 was narrow and has speed restrictions, Senior Sergeant Ian Campion said.
Motorists were now faced with four-lane open stretch of road and treating it as a racetrack, Mr Campion said.
"We are not just talking about drivers whose speed has drifted up a notch through lack of concentration, we are talking about high speeds, well in excess of the limit, and in most cases these appear to be deliberate acts."