And could lead to simple expansions like linking the facilities to alert snow plow crews with VMS's to alert drivers. Architecture is all about this combining of what hitherto were different worlds. Another example of two seemingly totally different services that once worked out turn out to overlap in subsystems is that of the set Mayday and Haz. Traffic can be controlled using signals, including variable message signs for detours. A less strict form of influencing driving behavior is offered by Information Systems.
General systems are of the broadcasting type, the information they give is the same for everybody.
Some countries value the impact these information services have sufficiently high to justify a public funding. Tailor-made information services will be private everywhere. For automated control a direct link from the roadside to the vehicle will be needed. Beacons offer the most feasible solution. These beacons can also be used to obtain information from vehicles, like information on road surface conditions.