This data flow from an in-vehicle signage transmitter indicates the status of the barrier system (e.g. open, closed) and whether access has been granted. The data flow may contain the actual data from which instructions to the driver and traveler can be produced by roadway information devices or it may contain a message code that causes a specific display. It consists of the following data items each of which is defined in its own DDE:

+ barrier_info

Sub Data Flows

Parent Data Flows

Associated PSpecs

Parent Information Flows