A 60-year-old Janesville man is facing a 6th Offense Operating While Intoxicated charge after a weekend traffic crash.  Janesville police say the suspect rear-ended a semi-truck (Sunday) night just before 8:00 o’clock at Humes and North Wright Roads.  Officers say the driver of the car, Joseph C. Jansen showed signs of impairment and failed standardized field sobriety tests.  Jansen was taken to the Rock County Jail to await his initial court appearance.  He was also cited for Following too Closely.