traffic regulation, control of the movement of vehicles and pedestrians, chiefly on city streets. Formal regulation of motor vehicle traffic was instituted in New York City in 1903; a set of Rules for Driving was issued by the police commissioner, and a traffic squad was formed. Similar systems were soon adopted in cities all over the world. Since that time, as the volume of traffic has increased, a variety of control mechanisms have been developed to regulate the safe flow of traffic.
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