A motorist was killed Wednesday in a crash on the Ortega (74) Highway west of Lake Elsinore, during which the victim’s sedan rolled down a steep embankment. The fatality occurred at 1:25 p.m. Wednesday on the westbound side of the corridor, near Main Divide Truck Trail, according to the California Highway Patrol. The agency said the victim, whose identity was not immediately released, was at the wheel of a Honda Civic that apparently went out of…