RIVERSIDE (CNS) - A countywide crackdown on drunken and drug-impaired  motorists netted 164 arrests in the first three days of the operation,  authorities said today.

The end-of-summer Riverside County Avoid the 30 campaign -- named for  the number of police agencies involved -- got under way Friday morning.

Between then and Sunday night, saturation patrols and sobriety  checkpoints were deployed in a number of locations, including Banning,  Beaumont, Corona, La Quinta, Moreno Valley, Murrieta, Norco, Palm Springs,  Perris, Rancho Mirage, Riverside and Temecula.

The 164 motorists arrested on suspicion of DUI since Friday compare to  162 arrested during the same phase of last summer's Avoid campaign, according  to Riverside police Lt. Mark Rossi, the Avoid coordinator.

Two people were killed and five people were seriously injured in a  possible DUI-related collision over the weekend, according to the California  Highway Patrol.

The Avoid crackdown, which continues through Labor Day weekend, is part  of a national campaign, ``Drive Sober or Get Pulled Over.''

This week, anti-DUI operations are planned in Desert Hot Springs,  Menifee, Murrieta, Palm Springs and Riverside.

The Avoid campaign will coincide with the CHP's ``Maximum Enforcement  Period,'' which is set for Aug. 30-Sept. 2. During the MEP, all available CHP  officers hit the streets to nab intoxicated motorists, speeders and other  traffic violators.

During last summer's two-week Avoid campaign, 710 people were arrested  on suspicion of DUI, compared to 762 in 2011, according to figures.