Three suspected drunken drivers were arrested at a checkpoint staffed by sheriff's deputies from the Temecula station.
The checkpoint was staffed between 8 p.m. Friday and 3 a.m. Saturday on Winchester Road, at Nicolas Road, officials said.
Deputies screend 1,973 vehicles, out of 3,485 vehicles that passed through, with 82 vehicles sent to a secondary stage to be checked, Riverside County sheriff's Sgt. John Magnan wrote in a news release.
Four motorists with alleged license violations were ticketed and ordered to appear in court, and seven vehicles were impounded, Magnan said.
Deputies administered 12 field sobriety tests, the sergeant said.
The operation was funded through the state Office of Traffic Safety.