This study's objective is considering two main innovative criteria in evaluating alternatives of different road designs. It focuses on regret theory and its utility in evaluating between different alternative designs and develops new criteria in the assessment of a traffic safety performance indicator.

Decisions between different road construction alternative designs are based on multi-criteria factors. This research develops a systematic methodology in considering regret based on a weighted system of performance indicators that include, planning, traffic flow, traffic safety, construction economics, and time. Due to uncertainty, a process to formulate a regret matrix is developed that introduces criteria to evaluate between different alternatives. A full set of procedures for developing the matrices are classified. Sensitivity of weights on the overall results is also tested to ensure reliability of subjective quantities.

Meanwhile, most research studies today for evaluating road designs emphasize in traffic flow more than traffic safety. A technique that allows for the quantification of a performance indicator for traffic safety is proposed, based on direct factors and the likelihood of conflict in a microscopic level. The performance indicator for traffic safety is included in the regret matrix for the evaluation between different road design alternatives.