Buena Park Police Department's Traffic Unit holds a DUI/drivers license checkpoint from 7 tonight through 3 a.m. Saturday.
The location is near the intersections of Beach Boulevard and Stanton Avenue.
The Irvine Police Department conducts a sobriety checkpoint that starts an hour later (8 p.m.) and ends an hour sooner (2 a.m.).
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It's in the area of MacArthur Boulevard and Douglas, according to the department.
Officers in both cities will look for signs of alcohol and/or drug impairment and check drivers for proper licensing.
Cops vow motorists will only be delayed momentarily.
Funding for the checkpoint comes to the cities from a California Office of Traffic Safety grants, through the National Highway Traffic Safety Administration.