A comparison is made between the rolling horizon strategy of traffic signal control at an isolated intersection and the strategy of switching the signal when a queue vanishes. It is shown that the former strategy has some undesirable consequences.

S. L. Albin has described extensive simulations of queue behavior for a system with a single server and an arrival process that is a superposition of n renewal processes. The simulations show, among other things, that as n increases for a fixed traffic intensity \rho, the queue behavior...

Approximate analytic methods are used to describe how the equilibrium trip time of an elevator depends upon the physical characteristics of the elevator, the passenger demand, and possible strategies of operation. The analysis is directed particularly toward elevators in buildings of moderate...

Suppose that a vehicle or convoy enters a two-lane unidirectional roadway and travels at a velocity v* less than the prevailing traffic. This moving bottleneck may cause a queue to form as vehicles try to pass the obstruction. It is shown that by going to a moving coordinate system traveling at...

The following is a critique of the paper "Traffic Dynamics" written by Ross (1988).

In the theory of "kinematic waves," as described originally by Lighthill and Whitham in 1955, the evaluation of the shock path is typically rather tedious. Instead of using this theory to evaluate flows or densities, one can use it to evaluate the cumulative flow A(x, t) past any point x by time...

Suppose that one specifies the times at which vehicles enter each freeway junction and where (but not when) they will exit. The problem is to determine the cumulative flows past various points of the freeway, trip times, etc. To solve this problem, one must combine the equations of traffic...

Deterministic approximations for elevator trip times are applied to a system of m elevators. Comparisons of in-system time of passengers are made for elevators which are (a) physically separated, (b) ideally controlled, (c) zoned, or (d) uncontrolled. A more detailed study is then made of...