Congestion in the air traffic system, both recurrent and non-recurrent, is typically handled by rationing access rights to individual resources such as airports or important parts of the airspace. Under the planning paradigm employed in the US, this rationing process occurs independently at each...

This paper is concerned with the performance of multi-commodity capacitated networks in a deterministic but time-dependent environment. For a given time-dependent origin-destination table, the paper asks if it is easy to find a way of regulating the input flows into the network so as to avoid...

This paper demonstrates how to construct the boundary of the clear zone adjacent to a roadway alignment, based only on horizontal sight distance considerations, when the alignment data are piecewise-linear on a fine lattice. In this case, it is shown that the clear zone envelope is...

This paper presents improved time-dependent control strategies for small freeway networks with bottlenecks and unique origin-destination paths. It is assumed that there are no spill-overs from any of the freeway exits so that freeway queues and delays can be completely avoided by regulating...

Many transportation design problems involve the demarcation of safe zones surrounding the intended guideway, either to prevent physical collisions or to provide clearance for other requirements such as sight distance. Typically, an instantaneous solution to one of these problems can be...