The freeway access control problem-a survey of successes and continuing challenges

The primary goal of the paper was to elucidate the basic structure of a freeway access control problem, captured realistically before the application of any assumptions to improve tractability. Granted, it is not reasonable to postpone these assumptions indefinitely; the fluid approximations, for example, greatly improve the chances of realizing good analytical solutions. Rather than take them for granted, however, it is useful to investigate their consequences in the context of the original problem. This is an important problem, and there are many other aspects worth expanding upon that cannot fit within the confines of this survey paper.