Twisted wreckage on westbound Sumneytown Pike near the intersection of Wambold Road snarls traffic for several hours Wednesday. Towamencin Township Police say it happened when a tractor trailer hit another 18-wheeler that was parked on the side of the road. The driver that caused the crash was treated at the scene and then taken away by police. According to reports, the big rig that hit the tractor trailer on the side of the road, was carrying fertilizer. The truck on the side of the road was hauling agricultural limestone.