The Advanced systems of Traffic Management (AMTS) in operation in France are complex and break down into different sub-systems (central data processing, road dynamic equipment, power supply, transmission networks ensuring communication between TMC (Traffic Management Center) and dynamic road equipment, many applications inside the TMC site and outside with TMC neighbouring networks). The modern system of road management assistance depends on remote control, starting from one or more central stations, for numerous and diverse dynamic road equipment. In this report, the authors will only be looking at communication networks between dynamic equipment and TMC, as well as exchanges between the TMC and neighbouring networks. However, a distinction must be made between some AMTS which are managed by the engineering departments of the French Ministry of Transport (FMT), and others, managed by concessionary companies - in particular those of the motorways - such as ASF, AREA, etc. The authors are only going to deal with those AMTS managed by the engineering departments of the FMT. The telecommunications networks built (or being built) adhere to a world-wide standard of technology recommended by the organisation UIT-T. Since the Eighties, the engineering departments of the FMT have conceived its telecommunications networks respecting the market trends. However, the FMT has been dominant in the choice of the communication protocols, as well as the nature of the exchange between road dynamic equipment and TMC. There are no standard communication protocols for dynamic road equipment, as each country has it's own requirements and references. The harmonization of the techniques of telecontrol and remote control of this equipment constitutes, for the road operators, a need to simplify the design of these systems, and to reduce the costs of putting them into action and following up their later evolution. For these reasons, since the Eighties the engineering departments of the FMT have undertaken a standardization of these protocols which has led to the creation of a Road Language Communication (LCR) and to a serial communication protocol called TEDI. In this document the authors will describe the telecommunications networks being built in France, as well as the communication protocols between dynamic equipment and TMC: TEDI / LCR.
Abstract