Abstract
Traffic safety planning on urban expressway becomes important problem. Three methods to obtain better combination of countermeasures within certain budget were already proposed. They all have mathematical crisp formulation. On the contrary, fuzziness in actual economical evaluation should be considered for advanced traffic safety planning. Some application of fuzzy set theory will be shown in this study. Fuzzy budget constraints are used for modification of Incremental Benefit-Cost Analysis and Dynamic Programming Approach. For further investigation, fuzzy benefit coefficients are also discussed to obtain and display more actual alternatives.
