Guidelines for safety and design improvements at rural expressway median crossovers

Rural expressway median crossovers are a special type of unsignalized intersections. The operation of these intersections is governed by driver gap acceptance. It was found that there were safety and operational problems associated with these intersections, primarily during the rush hour. This research is conducted as part of the study to develop "Guidelines for safety and Design Improvements at Rural Expressway Median Crossovers" and it forms the second phase of the research. The objective of the proposed research was to conduct field studies to validate the usage of analytical tools like CORSIM, which was found to be useful in PHASE I and to evaluate the effectiveness of these tools in determining the operational problems. The calibration and evaluation process was applied to particular field locations in Missouri. The research developed a set of procedures for the application of such calibrated analytical tools.