ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,431,014, issued on Sept. 30, was assigned to TONGJI UNIVERSITY (Shanghai).

"Method and system for active control of road network traffic congestion" was invented by Minhua Shao (Shanghai), Yuncheng Zeng (Shanghai) and Lijun Sun (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and system for active control of road network traffic congestion, and in particular, to the technical field of traffic congestion control includes: constructing a directed graph according to the positions of detectors in a road network; determining a free-flow reachability matrix of the directed graph and a plurality of neighborhood matrices with different orders ...