A traffic flow controller for nonstationary velocity profiles on automated highways

In this paper a traffic flow controller designed under the automated highway system (AHS) hierarchical control structure proposed in the California PATH program is introduced. The controller's purpose is to sustain nonstationary velocity profiles on fully automated highways. Traffic flow modeling and controller stability are discussed. The usefulness of nonstationary velocity profiles in creating a moving area of low vehicle density is stressed. Results obtained using SmartCap, a traffic flow simulation program, demonstrate application of the controller to the fast circulation of an emergency vehicle in AHS while high traffic flow is maintained.