A total of 19,418 motor carriers were surveyed from 1970 through 1972 at 14 Oklahoma highway scale houses. The data collected for each motor carrier were commodities aboard, directions of movement, state of motor carrier registration, body styles of units, and time of day passing scale house. A review of federal, state, and local hazardous materials controls was also conducted, including accident response and clean-up procedures. The survey indicated that ten percent of all commodities on motor carriers represented hazardous materials. Gasoline was the most frequently detected hazardous material, representing nearly 25 percent of all hazardous materials. Hazardous materials shipments were found in greatest frequency on the major interstate highways with the net movement toward metropolitan areas. It was also noted that no local or state controls existed for routing, compatibility of mixed cargoes, stability of cargoes, or clean-up and disposal of hazardous material incidents.