Abstract
Although time is easy to measure, some accessibility indicators are more complex, producing different results. Therefore, choosing which indicators to use can be difficult. The NOD software has been developed for optimizing transport studies in planning. Based on properties of transport graph, several accessibility indicators can be used and combined in this program for evaluating transport impacts on time and on space. Two indicators that can be generated simultaneously by NOD are presented in this article: the 'indicateur de circuité' that measures routes with constrained roads and the indicator that measures optimal routes. Three examples of simulation are presented (autoroutes A20 Vierzon/Toulouse, A51 Grenoble/Sisteron, A75 Clermont-Ferrand/Beziers) and which illustrate that sometimes 'good effects' are not as good as they seem to be with a 'basic' accessibility indicator...