This morning the Shepherd Hill area was once again the scene of an 18-wheeler crash. An 18-wheeler was southbound on I-45 with several pallets of hospital type oxygen bottles. For unknown reasons the driver hit the guard rail at Calvary and ran off the roadway losing his load. Miller Heavy Duty Wrecker and Hazmat International are on the scene reloading the truck and clearing the scene. At this time the right lane is closed as is the Calvary Road southbound exit.