(Lake Osweg, OR) -- State transportation officials say a faulty road joint on the flyover ramp connecting northbound I-5 to Oregon 217 in Lake Oswego may be the cause of several crashes over the past few days. Three crashes happened within hours of each other yesterday. The department says the teeth of the road joint are slightly out of alignment. That can cause problems for drivers who take the ramp at highway speeds rather than slowing to the posted 35-mile-an-hour speed limit.