Lennox and Addington OPP have charged two people with impaired driving.
On Friday just before noon, officers received a report of an erratic driver on the eastbound 401.
The 41-year-old Belleville man failed the roadside test according to police.
Andrew Wilson is facing impaired driving charges, driving while carrying a prohibited weapon and possession of a Schedule 1 substance.
A few hours later, officers stopped another vehicle heading west on the 401 following another driving complaint.
Joseph Kalamba, 32, of Gatineau, Quebec is facing impaired driving and having a blood alcohol concentration over 80 mgs.
Both men had their cars impounded and licences suspended for seven days . Both will appear in Napanee court on May 7.