The California Highway Patrol and San Luis Obispo Police will conduct a sobriety checkpoint Saturday at a location near San Luis Obispo.

The checkpoint will be operated from 7 p.m. to 1:30 a.m. Such checkpoints are placed on roads identified as having drunken driving problems.

Motorists are detained a few moments while their drivers licenses are checked and to determine if they have been drinking. The main value of checkpoints is their psychological influence, the CHP said in a news release.

Although they do not result in a lot of arrests, checkpoints tend to reduce the number of drunken drivers on the road.