3 leads roadkill rankingsKINETIC EFFECTS Wildlife over- and underpasses have helped decrease instances of roadkill, but Freeway No. 3 still leads the nation in total numbers, if not impact densityBy Wu Liang-yi / Staff reporterStatistics about animal roadkill on Taiwan’s freeways showed that the Formosa Freeway (Freeway No. 3 and the National Sun Yat-sen Freeway (Freeway No. The Freeway Bureau first began surveying animal roadkill on freeways during a conservation project in 2007 to reduce the roadkill numbers during the mass migration of purple crow butterflies. The freeway roadkill survey is jointly conducted by the bureau’s Engineering Division, road cleaning and maintenance personnel, as well as incident response personnel, who keep records of the roadkill circumstances and species.