Determination of optimum horizontal curvature.

摘要

In spite of being in existence for decades, the present practice of two-lane horizontal curve design has several drawbacks. In consideration of the drawbacks of the present design practice and based on expected total cost and expected change in total cost, models are developed for determining optimum degree of curvature (D;A model is developed to accommodate the consistency and environmental constraints that are critical in road construction in difficult terrain. Computer programs are also written to obtain D;It is revealed from the theoretical studies, model development, and model application presented in the dissertation that: (a) D