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Development of ATMA Deployment Guidelines Considering Traffic and Safety Impacts
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2022-10-12
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Edition:Final Report (1/2020-12/2022)
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Abstract:The Autonomous Truck Mounted Attenuator (ATMA) vehicle system is a quickly emerging technology that leverages connected and autonomous vehicle (CAV) capabilities for maintenance of transportation infrastructure. Because practicable and implementable guidance for deployment of this technology is largely missing in MUTCD, State DOTs have been making their own deployment criteria. In this project, we focus on the Operational Design Domain (ODD) problem, i.e., under what traffic conditions should ATMA be deployed. To this end, modeling efforts are first focused on the derivation of an effective discharge rate that can be associated with a moving bottleneck that is caused by slow-moving ATMA vehicles on a multilane highway. Then, based on the demand input and discharge rates, microscopic traffic flow models are employed to calculate vehicle delay and traffic flow density, which the Highway Capacity Manual (HCM) suggests are key indicators of a multilane highway’s level of service (LOS). In this way, the linkage between AADT and LOS is analytically established. NGSIM data is used for the model validation and shows that the developed model correctly captures the effective discharge rate discount caused by moving bottlenecks. The modeling results demonstrate that roadway performance is sensitive to the K factor and D factor, as well as the operating speed of ATMA and, if LOS=C is a desirable design objective, a good AADT threshold to use would be around 40,000 vehicles per day.
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[PDF-2.43 MB]
