William Blaine Larimer, a 57-year-old Spotsylvania man, was arrested on I-95 Friday afternoon for drunk driving. Larimer was driving an 8-passanger vanpool when he was arrested. Police were alerted to the Larimer's possible intoxication by a fellow driver who called into police to report his erratic driving. A State Trooper stopped the van after observing the driver weave. Larimer was charged with a second offense DUI, refusal to submit a breath/blood test and failure to obey highway markers.