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Abstract
A detailed study has been made of the conditions under which the average vehicle is driven in the Tehran area. This study was needed to assist the Iranian Department of Environment in developing a driving cycle and test procedures for motor vehicle exhaust emissions.
A preliminary traffic survey was made in which average vehicle speed and traffic densities were measured for different streets at various hours of the day. As a result of this survey, representative routes were selected. A large number of runs were made in Tehran Traffic using cars instrumented to continuously record engine speed, manifold vacuum pressure, and other pertinent data.
The measurements indicate that the average driver in Tehran spends 38% of his driving time idling. He moves at constant speed cruise 21% of his time at an average speed of 22.4 kilometer per hour. The average driver accelerates 22% of the time. He decelerates 14% of the total time.