Ontario Provincial Police are concerned about a recent surge in impaired driving charges.

OPP say in the past 30 days, they have laid more than 180 alcohol-related criminal driving charges across the province.

Many of the charges came as a result of collisions and police say some of the drivers have registered upwards of three or four times the legal limit.

The OPP calls the growing number of charges "troubling" and says impaired driving continues to be a leading cause of death and injury on Ontario highways.