What is NOT included in the definition of "motor vehicle" according to Texas Transportation Code?

The definition of "motor vehicle" in the Texas Transportation Code specifically excludes vehicles that run exclusively on fixed rails. This is because these types of vehicles, such as trains or trolleys, are fundamentally different from other motor vehicles that operate on streets and highways. Motor vehicles are typically those that are self-propelled and designed for operation on roads, which would include motorbikes, cars, and buses, all of which are intended for use on public roadways and are subject to the regulations that govern their operation.

In contrast, fixed-rail vehicles do not fall under this category as they are confined to their tracks and do not operate on typical road infrastructure. Understanding this distinction is crucial when discussing regulations, licensing, and safety standards that apply to various types of vehicles in Texas.