The following words and terms, when used in this subchapter, shall have the following meanings, unless the context clearly indicates otherwise: (1) Commercial motor vehicle--Any vehicle used on the highways in the transportation of hazardous materials in commerce, in a quantity requiring placarding under regulations issued under the federal Hazardous Materials Transportation Act (Title 49, United States Code, §5101 et seq.) (2) Commission--The Texas Transportation Commission. (3) Department--The Texas Department of Transportation. (4) District--One of the 25 geographical areas, managed by a district engineer, in which the department conducts its primary work activities. (5) Executive Director--The Executive Director of the Texas Department of Transportation. (6) Hazardous material--A substance or material, including a hazardous substance, which has been
determined by the United States Secretary of Transportation, pursuant to the Hazardous Materials Regulations contained in Title 49, Code of Federal Regulations, Chapter I, Subchapter C, to be capable of posing an unreasonable risk to health, safety, or property when transported in commerce, and which has been so designated. (7) Highway route--Any road or highway open to the public. (8) Non-Radioactive Hazardous Materials (NRHM)--A non-radioactive hazardous material transported by a motor vehicle in types and quantities which require placarding, pursuant to Table 1 or 2 of Title 49, Code of Federal Regulations §172.504. (9) Political subdivision--A county, municipality, local board, authority or commission, or public corporation, established under the laws of the state of Texas, that has the authority to construct and maintain a public road or highway. (10) Routing designation--Any regulation,
limitation, restriction, curfew, time of travel restriction, lane restriction, routing ban, port-of-entry designation, or route weight restriction, applicable to the highway transportation of NRHM over a specific highway route or portion of a route.