THIBODAUX - A man riding a lawnmower along a south Louisiana highway was killed when he tried to cross the road. 

According to State Police, 77-year-old Larry Helm was riding a Craftsman lawnmower and tried to cross LA-1. Helm was hit by a GMC truck and died at the scene. 

The occupants of the truck were not injured. Troopers said impairment is not suspected.