This report, part of the “Cities” collection, analyses road accessibility, transport corridors and checkpoints set up in border towns in West Africa. An innovative model shows that the population base of border towns could be 14% greater if there were no delays at border crossings. The existence of roadside checks decreases the size of this population base from 12 to 50%. A study of 59 jointly planned or operated border posts in sub-Saharan Africa shows that trade facilitation runs up against the special interests of public servants and private-sector actors making a living from regional integration frictions.Also in this Collection: “Regional Integration in Border Cities”, No. 20 “Population and Morphology of Border Cities”, No. 21 “Businesses and Health in Border Cities”, No. 22