Example of a FHWA traffic study, or a synopsis of a few studies....
Traffic Performance of Three Typical Designs of New Jersey Jughandle Intersections - FHWA-HRT-07-032
NJ jughandles
A branch in the company I work with models these...it is quite amazing to run a model and compare it to the actual road intersection, and find that the model is accurate.
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'75 914 GT-3
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