Howard County police arrested five people at a weekend sobriety checkpoint conducted on northbound Route 1 and Davis Avenue in North Laurel.
Three people were arrested for driving under the influence, including one driver who was under the age of 21. Two others were arrested for driving on a suspended license.
Police said 690 vehicles pass through the checkpoint, which started late Aug. 17 and went into the morning hours of Aug. 18. Seven vehicles were pulled over for further examination.
The checkpoint was manned by county police and Maryland State Police. The checkpoints are part of the national "Drive Sober or Get Pulled Over" campaign and are funded in part by a grant from the Maryland Highway Safety Office.