Active traffic management (or ATM) is the regular adaptation of facility configuration and controls in response to (or in anticipation of) variations in demand, incidents, and weather to maintain optimal facility productivity. This synthesis documents the state of the practice associated with designing, implementing, and operating ATM on arterials. Of particular interest to this study has been information on strategies used to actively manage traffic and congestion on arterials; situations and operating conditions in which ATM strategies have been successfully and unsuccessfully deployed on arterials; and system and technology requirements associated with implementing the strategies. Of secondary interest to this study has been information on institutional issues associated with implementing ATM for arterials; operations and maintenance requirements associated with implementing these strategies; and the benefits and costs associated with implementing these strategies. Although demand management has not been the focus of this synthesis, traveler information and route guidance tactics are covered in this report. Information used in this study was acquired through a review of the literature and in-depth interviews of selected transportation agencies.
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