Just two people have so far been caught driving in Rotorua with a breath alcohol reading between the old and new limit, but police say it's too soon to say if drivers are getting the message.
On December 1 a law lowering the breath alcohol limit from 400mcg to 250mcg of alcohol per litre of breath for drivers over 20 came into force. The limit for those under 20 remains at zero.
Drivers caught between 251 and 400mcg now receive an instant $200 fine, 50 demerit points and a ban from driving for 12 hours but this does not result in a criminal conviction.
Rotorua officer in charge of road policing, Senior Sergeant Nicky Riordan, said since the law change, police had apprehended two drivers who blew between between 251 and 400mcg of alcohol per litre of breath.
She said Rotorua police were maintaining their presence on the roads and were carrying out routine checks as normal, but hadn't launched any specific operation to target drink drivers since the change.