A truck fire has shut down all northbound lanes of I-75 in Sarasota County. Emergency vehicles responded just after 11:35 a.m. Friday to the I-75 North ramp from Exit 195 at Laurel Road in Nokomis. The Laurel Road ramp and all lanes of I-75 are closed. Traffic cameras show a fire truck and an ambulance parked across the interstate with first responders blocking all lanes. It's not clear what led to the fire or if anyone was hurt. "For your safety please seek alternate routes and expect delays in the area," the Sarasota County Sheriff's Office wrote.