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In a Personal Rapid Transit (PRT) system, a passenger makes his trip non-stop under automatic control over a guideway network in a small, i.e., "personal" car provided him on demand. A PRT system must have high line capacity, e.g., 2 to 3 times that of a freeway lane. High capacity can be achieved by operating cars at very short headways or separations, but at some risk of serious collision...