United States Department of Transportation
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Open Source Surrogate Safety Assessment Model, 2017 Enhancement and Update: SSAM Version 3.0 [Tech Brief]
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2016-11-17
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By Bared, Joe
[PDF-574.03 KB]
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NTL Classification:NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Flow;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-GEOGRAPHIC INFORMATION SYSTEMS-GEOGRAPHIC INFORMATION SYSTEMS;
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Abstract:The ETFOMM (Enhanced Transportation Flow Open Source Microscopic Model) Cloud Service (ECS) is a software product sponsored by the U.S. Department of Transportation in conjunction with the “Microscopic Traffic Simulation Models and Software—An Open Source Approach” project. ETFOMM’s primary components are the core microscopic traffic Simulation Engine (ESE), a graphical user input editor (ETEditor), a 3D traffic visualization tool (ETAnimator), and a database in cloud service environment. Moreover, the SSAM is being converted into open source software, enhanced, and integrated as part of ESE. SSAM is a popular safety tool box that utilizes the microscopic traffic simulation vehicle trajectories to generate safety performance measures such as: Minimum time to collision (TTC). Minimum post-encroachment time (PET). Initial deceleration rate (DR). Maximum speed (MaxS). Maximum relative speed difference (DeltaS). Location of the conflict event (CLSP, CLEP). Maximum “post collision” DeltaV (MaxDeltaV).
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