Transportation of goods and passengers, especially by road and land, has been one of the most important needs of the human since ancient times until today. But some problems such as, environmental pollution that caused by transportation, increasing damages due to accidents, reducing energy resources, traffic controlling and management problems, and increasing unauthorized speeds caused people to think of using new and effective solutions in this way, to solve the existing problems and improve the transportation process. So using from ITS, has been able to solve these problems largely. Intelligent Transportation System (ITS) is a new concept in this way that means the use of new technologies such as communications, controls, and electronic systems and increase the efficiency, security and dynamism of transportation. This article first introduce the ITS system and the effect of this system in road transportation, then the run of ITS system in Iran until the end of year 1400. The findings show a decrease in air pollution (25% in Sydney city according to statistics), a decrease in fuel consumption (10% in Paris city according to statistics), an increase in efficiency and traffic flow monitoring in the world's leading cities due to the use of ITS system, and also the use of some intelligent systems such as online traffic counter, weigh in motion, variable message displays and speed control and video surveillance cameras in the provinces of Iran by the end of 1400.