McMahon, Glenda Chatterton, Ken Large multibore culvert 1 Large multibore culvert 1 WEDC;Technical;Diagram;Transport, roads, vehicles and safety;International and Development Communication 2019-05-08
    https://repository.lboro.ac.uk/articles/figure/Large_multibore_culvert_1/8094467
10.17028/rd.lboro.8094467.v1