More than 4000 drivers were breath-tested in Nelson during the Bay Dreams festival and police say they're pleased with the results.
Over the past three days Canterbury and Tasman Police have been at checkpoints completing compulsory breath-tests and impairment checks.
One person faces court action and five others have been issued infringement notices for excess breath alcohol.
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These people were given a $200 fine, 50 demerit points and were forbidden to drive for 12 hours.
"The results have been really pleasing, with the vast majority of attendees having a plan in place to get home safely after the event, utilising parents, sober drivers, walking, and alternative transport such as buses and taxis," Tasman Road Policing Team Leader Senior Sergeant Grant Andrews said.
"It was great to see so many people enjoying the summer weather while taking their travel and safety, and that of others, so seriously."
The roads in the region are extremely busy due to the large volume of people returning home over the coming days, Mr Andrews said.
Motorists should be weary of this, turn off their cellphones while driving, ensure everyone in the vehicle is wearing their seatbelt, and drive to the conditions, he says.
He also advises avoiding distractions and alcohol, and driving at safe speeds.