"Guys finishing work and going down for a beer anywhere that is a bit more out of the way will be a bit more worried to go and have that beer and then drive home after they have had it.
"The after-work beer might dwindle, which will affect businesses that already have low profit margins and high compliance costs."
Drivers caught between 251mcg and 400mcg will receive an instant $200 fine, 50 demerit points and a ban from driving for 12 hours but this will not result in a criminal conviction.
Wairarapa Road Safety Council manager Bruce Pauling said he expected a sharp increase in the number of Wairarapa residents getting penalised for being over the limit.
"There is always a period of time with new legislation where people forget that there is new legislation in place," he said.
"I have seen figures from NZTA suggesting there will be a jump in figures and I do fully expect that to happen.
"It's unfortunate but sometimes people do, regardless of the amount of advertising, tend to get caught up and forget about the new laws, especially with the Christmas season coming up there will be people being stopped and prosecuted.
"It's necessary however because, as research has shown, people with lower reduced levels of blood alcohol still have problems recognising how much effect, even a small amount of alcohol, has on their ability to drive."
Data from the Ministry of Transport showed a drop in the number of drink-driving offences in the region from 303 in 2009 to 259 in 2013 under the present alcohol limit.
Transport Agency road safety director Ernst Zllner said the new limits were a necessary change and a "game-changer".
"Drink-driving inflicts a huge amount of pain and suffering on New Zealand families and communities, and this change sends a clear message to those who would put themselves and others at risk by driving while affected by alcohol," he said.
"Together with other recent changes including zero alcohol limits for teens, alcohol interlocks and new penalties for serious and repeat drink-driving offenders, this measure will make New Zealand roads safer for everyone."
NZME.