This data flow contains the actual data from which instructions to the driver and traveler can be produced by indicators, dynamic message (DMS), short range communications equipment, and other types of signs on the roads (surface streets) in the vicinity of railroad grade crossings. It consists of the following data items each of which is defined in its own DDE:

+ list_size{crossing_id
+ hri_sign_control_data}

Sub Data Flows

Parent Data Flows

Associated PSpecs