Transportation systems play a crucial role in almost all areas of modern life. Intelligent transportation systems (ITS) are basically transportation technologies that support the operations of a state highway system through advanced wireless communication technologies. ITS are being used to improve the safety, comfort, efficiency, productivity, dependability, and cost-effectiveness of our surface transportation systems. They can potentially revolutionize mobility, changing everything from the way we move to how we design vehicles. This paper provides an introduction to ITS.