The objective of this paper is to present a mesoscopic simulation model of urban freight transport called SIMTURB. This model is based on the results and is an extension of the FRETURB urban freight model [1]. With an architecture based on a Markov process, this model offers a complement and to some extent an alternative to multi-agent simulation models, since it makes possible to characterise precisely the routes of freight transport vehicles in a conurbation and characterise the movements of each agent (e.g. vehicle).