(57) In a mobile system of the RTI type, that is to say a system of short-range communication,
between a vehicle and the roadside, beacons or radio beacons are utilized. Information
on traffic, for example vehicle traffic, is exchanged between the said beacons and
the mobile units when the latter pass respective beacons. At least some of the beacons
of the mobile system (1) are of the virtual type (VB). This means that positions (P)
which represent the said virtual beacons (VB) are specified in the system, preferably
in centrally placed elements (VB'). An alternative medium (2) cooperates in order
to access data between a respective mobile unit (M2) and a respective virtual beacon
(VB).
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