T his paper evaluates the entrance capacity and queueing delay for Automated Highway Systems through use of simulations and analytical modeling. Queueing statistics are also used to determine the sustainable capacity of alternative concepts, taking trip length distribution and spacing between ramps into consideration. Based on safety-spacing head­ ways (produced in a separate analysis), the mos...

The idea of vehicle-highway communications sufficient to assume driving functions for the driver is not new. Researchers have articulated both its value and feasibility for several decades; and military and vehicle manufacturer test facility developments have proven the concept’s viability. As mounting congestion conflicts with environmental constraints, the Automated Highway System (AHS) promi...

There is little doubt that those of us who are involved in the great industry of motor vehicle transportation—whether it be along the lines of design, maintenance, or operations—have come to recognize that street and highway capacity considerations are indispensable. It is unfortunate, however, that too often there is a lack of clear understanding of what we mean by capacity and how it actually...

Hypotheses and some results of the three-phase traffic theory by the author are compared with results of the fundamental diagram approach to traffic flow theory. A critical discussion of model results about congested pattern features which have been derived within the fundamental diagram approach to traffic flow theory and modelling is made. The empirical basis of the three-phase traffic theory...

Transportation assume no liability for the contents or use thereof. The contents do not necessarily reflect the official views or policies of the State of California or the Department of Transportation. This report does not constitute a standard, specification, or regulation. 2 Abstract In this report we present a methodology to decide capacity expansions for a transportation network that finds...

The importance of increments to an existing highway system depends upon the values they add to the pre-existing network. Over 50 years ago, Mohring [1965] suggested this logic for planning optimal highway investment programs. Moreover he argued it could be implemented by measuring the quasi-rents generated by specific additions to an existing roadway system. To our knowledge no one has managed ...