Development of multi CA model of 4-way road intersection

We describe our development of a road traffic multi CA (Cellular Automata) model of the four most common types of 4-way intersection (Yield-controlled intersections, Stop-controlled intersections, Signal-controlled intersections, and Roundabout-based intersection). We developed this model to study how these four different types of 4-way intersection affect road traffic flow & congestion in general and ldquotravel timerdquo in particular. In this paper, we focus in particular on the mathematical algorithm, on the model abstractions, and on the simulator architecture. We adhere as much as possible to the CA paradigm as a way of avoiding hard to detect inconsistencies that could invalidate the model and the results obtained by using it.