Traffic status reports and traffic forecasts of a central traffic station are optimized by a central traffic station by a process for the completion and/or verification of data concerning the status of a traffic network in a central traffic station data of the following types are used for this purpose: measurement data measured up to the present time; status data that are calculated for at least a point in time prior to the current time concerning the status of the traffic network at this point in time; and forecast data calculated for a time in the past and concerning a future time with respect to this time in the past.