Studded tire season comes to an end today (Thursday) in Oregon. Heather Roberts reports on why ODOT is strict about studs.Those studded tires must be removed before April first, or drivers could get a nearly 200-dollar ticket.  According to Oregon Department of Transportation studies, studded snow tires cause more than 8-million dollars in damage to state highways every year. ODOT’s Peter Murphy says it’s simple physics. "If you have a rapidly spinning wheel with a stud of metal on it - a hard metal - and it comes in contact with asphalt, which is basically oil and rock, the steel beats the oil every time. That leads us to having a situation where the roadway goes away," Murphy said. He added the agency is aware there is still snow on some mountain passes so plows and sanders will still get out where and when  necessary.