Concord police said they arrested one person they suspect of driving under the influence of alcohol at a checkpoint they set up Saturday night.
Officers held the checkpoint at Willow Pass Road and Mt. Diablo Street from 7 p.m. Saturday to 3 a.m. Sunday.
According to police, around 489 vehicles were contacted during the eight-hour checkpoint.
Checkpoint locations are based on a history of crashes and DUI arrests, and are held to deter drivers from driving impaired, police said.
Funding for this checkpoint was provided by a grant from the California Office of Traffic Safety, through the National Highway Traffic Safety Administration.