Traffic management is the collection of instruments that can be applied by road operators to guide and manage traffic flows. Traffic management is applied to optimise road use and traffic safety. ITS is a vital part of traffic management, as it allows the road operators to manage traffic fast and without the risk of human failures, in many cases on the basis of automatic traffic monitoring. Important instruments for traffic management are traffic models that determine management strategies, systems for traffic signalling and systems for informing traffic (VMS). ARS T&TT is active in all phases of the introduction of traffic management systems, including studies, design and implementation. The services include central systems, infrastructure based systems and in-car systems.