Santa Rosa police this weekend will be checking drivers for drug and alcohol impairment at an undisclosed location.

The checkpoint will run from 7 p.m. Friday to 2:30 a.m. Saturday somewhere within city limits, police said.

Checkpoints help get intoxicated drivers off the street and serve as a deterrent to others who might get behind the wheel when they should not, authorities say. But all it takes to avoid trouble is planning ahead, designating a sober driver or calling a taxi or car service. Beside the fact that convictions can result in costly fines and fees of up to $15,000 or more, drunken or impaired driving also leads to fatalities and injury crashes, police said.

Although alcohol consumption among drivers continues to be problem, studies also show a growing number of people involved in fatal crashes test positive for drugs, most often marijuana, police said.

“Everyone should be mindful that if you’re taking medication — whether prescription or over-the-counter — drinking even small amounts of alcohol can greatly intensify the impairment affects,” Santa Rosa police said in a news release.

The checkpoint is being funded by a grant from the California Office of Traffic Safety, through the National Highway Traffic Safety Administration.

You can reach Staff Writer Mary Callahan at 707-521-5249 or mary.callahan@pressdemocrat.com. On Twitter @MaryCallahanB.