The Highway Patrol investigated an accident in Cass County Monday afternoon on Interstate 49 involving a firetruck. According to the patrol report, a southbound firetruck with emergency equipment activated, slowed in the passing lane to turn into the emergency crossover. A pickup following the firetruck swerved into the opposite lane and passed but a vehicle following the pickup overtook and struck the rear of the vehicle.  John Mansfield, 55, of Clinton received minor injuries and was transported to Research Hospital.