A 59-year-old Janesville man is facing a 6th Operating While Intoxicated charge after being arrested early Friday morning. Janesville police say Mark S. Carlson was pulled over on Blackbridge Road about 2:00 a.m. after being observed swerving within the lane of travel. The officer also noticed the license plate did not match the vehicle. Police say Carlson showed signs of intoxication, but refused field sobriety tests. He was also arrested on charges of operating after revocation due to alcohol, no insurance, and displaying an unauthorized registration plate. He was taken to the Rock County Jail to await an initial court appearance.