Directional Sound for Long-Distance Auditory Warnings From a Highway Construction Work Zone. - Gridsada Phanomchoeng; Rajesh Rajamani; John Hourdos (IEEE Trans. Veh. Technol., 2010)

Design, specification, implementation and evaluation of a freeway queue warning system. - Zhejun Liu; Peter Dirks; John Hourdos (MT-ITS, 2017)