According to a method of vehicular traffic management, a computer system receives, from devices distributed in a plurality of roadway segments of a physical roadway system, real-time traffic information individually describing vehicular traffic in each the plurality of roadway segments. The computer system determines from the real-time traffic information an advised speed for a particular roadway segment among the plurality of roadway segments. The computer system transmits, via a communication network, a speed advisory command specifying the advised speed to a device in the particular roadway segment for presentation.