THE DEVELOPMENT AND VALIDATION OF A DIGITAL SIMULATION MODEL FOR DESIGN OF FREEWAY DIAMOND INTERCHANGES.
SYSTEM DEVELOPMENT CORP SANTA MONICA CALIF
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The principal goal of the project is to develop a valid general-purpose simulation model of a diamond interchange for traffic between a freeway and an arterial street. The existence of such a model will enable the traffic engineer to study the effects of alternative geometric and control configurations on diamond interchange operations. The principal emphasis of this study is on the validation problem. To validate the model efficiently, the complete interchange is separated into components, one of which, for example, is the merging of an on-ramp with the freeway. A computer model is then designed for that component, and its performance when the parameters are properly set is compared with that of existing real operations. If realistic performance is obtained, the next component of the interchange is then added otherwise, indicated modifications of the model are made and again compared with field data. This iterative process is continued until validation is achieved for the entire interchange model. An account is given of the work accomplished to date. This includes a complete description of the first version of Model 1, the merging of an on-ramp with the freeway. This model, as well as its data reduction program, has been programmed, debugged, and is running. Some of the results obtained with it are described, as are the results of the preliminary validation study. Author
- Civil Engineering