Its covers a wide range of transportation systems , some of which have been implemented for many years while others are just getting deployed or are still under research and development for future application . the main function of its is to improve transportation system operation , which in turn support the transportation objectives of increasing efficiency , safety , energy saving and environmental quality Its涉及到交通运输的很多领域，有些已经开始应用，有些还处于研究和发展之中， its的主要功能是通过改善交通系统的运行，达到提高效率，保障安全，节约能源和保护环境的目的。
