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Edition:Final report
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Abstract:This report documents an initial evaluation of horizontal curve design criteria which involved two phases: an observational study and an analytical evaluation. Three classes of vehicles (automobiles, school buses and tractor semi-trailers) and three selected curves (8, 31 and 38) were utilized in the study in order to determine vehicle path and speed. The analytical evaluation using the HVOSM was conducted to relate the vehicle dynamics during curve traversal to horizontal curve design criteria. Horizontal curve parameters were curve radius, vehicle class, speed, curve transition type and super-elevation rate. The report suggests that the use of spiral transition curves in horizontal alignment would improve traffic operations and recommends further research to confirm the change in steady-state steer characteristics on super-elevated curves.
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