An Australian study shows that wildlife tunnels effectively restore habitat continuity and population processes, but do not completely eliminate the effects of roads. Therefore, analysis and modeling of population viability should be utilized to predict effectiveness and appropriate selection of wildlife crossing mitigation.
Van der Ree, Rodney, Dean Heinze, Michael McCarthy, and Ian Mansergh. (2009). Wildlife tunnel enhances population viability. Ecology and Society. 14(2), 7.