Open Source Surrogate Safety Assessment Model, 2017 Enhancement and Update: SSAM Version 3.0 [Tech Brief]

2016PDFBriefFHWA-HRT-17-027HRDO-20/1-17(200)EEvaluation and assessmentTraffic flowVisualizationComputer programmingGeographic information systemsETFOMMEnhanced Transportation Flow Open Source Microscopic ModelCloud serviceOpen sourceSurrogate safety assessment modelCode3DNorth AmericaUnited States. Federal Highway AdministrationBared, JoeUnited States. Federal Highway Administration. Office of Operations Research and DevelopmentUnited States. Federal Highway AdministrationNTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic FlowNTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATIONNTL-HIGHWAY/ROAD TRANSPORTATION-DesignNTL-GEOGRAPHIC INFORMATION SYSTEMS-GEOGRAPHIC INFORMATION SYSTEMSFederal Highway AdministrationThe 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 \u201cMicroscopic Traffic Simulation Models and Software\u2014An Open Source Approach\u201d project. ETFOMM\u2019s 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 \u201cpost collision\u201d DeltaV (MaxDeltaV)