This data flow includes information about each device used to output traffic management commands to vehicle drivers at highway entrance ramps. These devices are used as a means of controlling access to highways particularly during periods of peak traffic flow. This data flow consists of the following data items each of which is defined in its own DDE:

+ list_size{ramp_identity + ramp_phase_data}

Sub Data Flows

Parent Data Flows

Associated PSpecs/Terminators