A crackdown on drink and drug driving over the Christmas period led to a total of more than 340 arrests across the Thames Valley area.
Figures from Operation Holly show nearly a nine per cent increase in the number of drivers caught under the influence.
In Thames Valley, 347 drivers were caught with alcohol or drugs in their system, in contrast to last year’s total figure of 316.
The campaign, which ran throughout Thames Valley and Hampshire, led to 601 arrests overall.
The operation saw 352 charged and a further 175 released under further investigation across the two areas.
Sergeant Rob Heard from the Roads Policing Joint Operations Unit, said: “Our commitment in roads policing is unwavering towards preventing the distress and misery caused by driving under the influence of drink or drugs.
“Such behaviour on our roads has far-reaching effects not just for the impaired driver, but for any innocent road users affected by their destructive decisions.
“The lives of individuals and their families can be torn apart through a combination of physical, psychological and legal consequences.
“Too many people continue to be complacent about the realities of road deaths and serious injuries. That’s why we want everyone to be clear about their responsibilities, and have respect for each other on the road.
“Our message is simple – don’t mix drink or drugs with driving – it’s not worth the risk.”
The operation ran for a month from December 1 2017 throughout Thames Valley and Hampshire and was a combination of high visibility patrols, covert operations and intelligence-led policing aimed at targeting persistent offenders and drink and drug drivers.
More than three quarters of those arrested were male, with the highest offending age group across the two regions aged 21 to 30 – far greater than any other age group.