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40 Other Performance Measures time) with the travel times resulting from different levels of traffic demand and access and circulation roadway config- At some airports, the adequacy of a roadway or curbside urations. However, it is difficult to accurately estimate these area has been defined by the length of time a motorist requires travel times and queues without the aid of microsimulation to enter and exit the terminal area. Microsimulation models models because of the relative short distances being ana- can be used to establish a baseline condition and compare the lyzed and the difficulty in estimating queue lengths through baseline travel time (or a predetermined acceptable travel other means.