A communications system for registering tolls, with vehicles which have
communications devices for wirefree communication between the vehicles
and the toll operator which is assigned to them and has a corresponding
communications device. In this context, the vehicles transmit toll
information relevant to the toll operator in a toll-registration area
which is assigned to the toll operator, and the toll operator determines
or bills the tolls to be charged therefrom. If the vehicles communicate,
by means of their communication devices, with other toll operators
outside the toll registration area of the toll operator assigned to them,
in order to register tolls, the exchange of toll-related information
takes place only when a certificate of the assigned toll operator is
successfully transmitted and on the basis of a public key or a private
key.