Abstract
The application of a set-theoretic decision method to the design of interchanges is introduced and the shortcomings of the aasho manual as a design programme are described. Four major components are indicated' the roadways in the interchange, the interchange as a system with particular characteristics and functions, the interchange as it concerns the driver, the material structure of the interchange. Diagrams for some clusters of requirements are given and an appendix is included on links among the requirements.