For the purposes of the current chapter, it is assumed that intelligent transport systems (ITS) should be taken to include all those systems that use information technology to inform, monitor, control or charge the traveller or to provide him with travel-related services such as pre-booking which might affect his travel decisions. With such a broad definition, the modelling issues centre on how such systems help to define the traveller's choice set or his perception of the attributes of the options available, and how this affects his behaviour. Modelling the impact of ITS innovations requires consideration of the full range of traveller responses and has implications for behaviour in the immediate future as well as in the short, medium and long term. The recognition that ITS innovations can affect behaviour in all these time scales has particular implications for modelling and adds weight to the argument for a more explicit representation of the dynamics of traveller behaviour.
Abstract