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Project Details

Title:A Comprehensive Safety Assessment Methodology for Innovative Geometric Designs
Principal Investigators:Ziqi Song and Anthony Chen
University:Utah State University
Grant #:DTRT13-G-UTC38 (MAP21)
Project #:MPC-480
RH Display ID:150736
Keywords:before and after studies, crash data, diamond interchanges, geometric design, safety, traffic congestion, traffic flow, travel demand


Utah has been a pioneer and leader in adopting innovative interchange and intersection designs. Currently, the state has six operating diverging diamond interchanges (DDIs) and more are under construction or planned. Four DDIs in the state have been opened to traffic for more than two years, which provides sufficient accident data for a comprehensive safety study. This study will be one of the first independent studies in the nation to investigate the overall safety impact of DDIs. The results will be useful in evaluating DDI construction and retrofit projects in Utah as well as other states. The research is expected to have a broad and significant impact on the implementation of innovative interchange and intersection designs.

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