Speed Models for Highway Consistency Analysis - A Colombian Case Study

Most evaluations of highway geometric design consistency are based on the analysis of vehicles’ speed. This paper reviews the main models of operating speed prediction on two-lane rural highways and presents a speed study carried out in Colombia. In the first phase of the research the validity for Colombia of speed models developed by researchers of other countries has been analyzed. Among the models evaluated are the one used by the Interactive Highway Safety Design Model (IHSDM). IHSDM is a computer tool developed by the Federal Highway Administration (FHWA) of the United States of America. The difficulties of their application to Colombian highways stand out, especially in mountain highways. Consequently, a speed study has been carried out with the purpose of obtaining models adapted to local conditions. Several speed models, applicable to different cases of horizontal and vertical curves, have been obtained.

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