Operational Evaluation of Effects Resulting from Freeway-Freeway Interchange Geometrics.

摘要

Improvements of freeway-freeway interchanges in Texas have been initiated through re-design and reconstruction. However, little documentation or definitive guidelines exist to assist in these efforts. Alternative designs need to be considered and evaluated for freeway-freeway interchanges. The operational impacts of alternative designs which will best accomodate current and future freeway demands must be evaluated. The research study focuses on the interaction between different freeway-freeway interchange designs and the resulting effects on operations and safety. The methodology followed to evaluate the operational effects of freeway-freeway interchange design consisted of four steps: (1) Determination of operational effects as related to different interchange types; (2) Assessments of the level and patterns of interchange accidents; (3) Analysis of geometric elements of interchanges; and (4) Case study examination of specific alternative interchange designs and improvements.