Accounting for route overlap in urban and suburban route choice decisions derived from GPS observations
Driver's route choice behaviour in an urban or suburban environment is influenced by a wide variety of factors. Among those factors, the similarity between route alternatives, established through route overlap, plays a prominent role due to the high density of urban and suburban street networks. Yet, how to account for similarities in dense networks is still an ongoing research issue, particularly considering the large set of alternatives the decision maker as well as the analyst is confronted
... lyst is confronted with. Neither of them is able to evaluate the full set of alternatives, the universal choice set. The analyst has to consider this not only in the generation of the choice sets but also in the modelling of the similarity effects. The similarity of a route with other routes can have different behavioural implications: On the one hand, it can reduce the probability of the alternative to be chosen because it is less distinguishable from other alternatives or because it shares risks due to common bottlenecks. On the other hand, it can also increase this probability by offering rerouting alternatives in case of incidents or by making the route stand out as the best of a class of essentially similar alternatives. The relative effect of the four different mechanisms in any choice situation is unclear a-priori. Therefore, more empirical work is needed to identify which of these mechanisms is dominant in which choice situation.