The checkpoint, stationed at Third Street east of Union Street, ended at midnight.
Only 50 vehicles passed through unscreened to alleviate traffic congestion. Police performed 17 field sobriety tests, but made no arrests.
Four unlicensed drivers were contacted, cited and released. Six moving safety violations were issued, and four vehicles were impounded, according to police.
The checkpoint was funded by an Enforcement and Awareness, DUI/Drivers License grant from the California Office of Traffic Safety, through the National Highway Traffic Safety Administration.
