More than 100 people were arrested in June for drink driving during the annual summer crackdown by Northamptonshire Police.
Officers breathalysed 2,767 and arrested 103 motorists – charging 72 with drink driving.
Police say the number of arrests represents a drop of 29 per cent on last year when about 2,000 people were breathalysed and 145 arrests were made.
The campaign was timed to capture the seasonal increase in drink driving associated with sunny beer gardens, barbecues and lighter evenings.
Head of force operations, Supt Andy Cox, said: “Even though we breathalysed more people, the number over the limit was considerably less. I am cautiously hopeful that motorists are finally starting to think before they get behind the wheel after having a drink.
“Our aim is not only to stop anybody who thinks it’s okay to drive while over the limit, but also to educate all motorists about the dangers of drink and drug driving.”
The Police and Crime Commissioner Adam Simmonds said he is focused on making Northamptonshire’s roads the safest in the country.
He added: “One of my top priorities is reducing the number of people killed or seriously injured on our roads.
“I am pleased to see the results of this campaign - it appears the message is getting through; if you’ve had a drink, don’t drive.”
Seven of the arrests were made between 7am and noon and of the 103 arrested, 26 were young drivers aged between 17 and 24.
Anyone who suspects someone of driving under the influence of alcohol or drugs is urged to call the Drivewatch Hotline, a 24-hour telephone service, on 0800 174615.
An online form is also available at www.northants.police.uk/drivewatch