A wide variety of Intelligent Transportation Systems (ITS) are developed to increase travel safety, improve traffic management and minimize environmental impact. C-ITS (cooperative ITS) are a subclass of ITS based on the communication between the vehicles and/or communication between the vehicles and the infrastructure. C-ITS are promising solutions to improve transport systems thanks to a local information processing. In that way, the information processing latency is minimal, the information is up to date and relevant to the current road environment context. Nevertheless the deployment of these systems in the vehicular ad-hoc network (VANET) raises many difficulties. Our goal is to help the designer of a C-ITS to focus only on the expertise that is required to satisfy his objectives and not on the technical issues that the deployment in a VANET implies. To reach this objective, we propose a platform which consists of a set of modules ITS (m-ITS), each of these m-ITS relies on a generic architecture hosting on stationary and mobile agents dedicated to the support of C-ITS in VANET. The objective in deploying mobile agents is reinforcing the local processing of the information. Finally an example of C-ITS for contextual speed management illustrates our proposal.