Among them, the most burdensome factor, according to Freund and Rocha (2010), is bureaucratic delays, with customs and port delays coming second and transit delays third. It measures the number of rural people living within two km of an all-season road as a proportion of the total rural population. An all-season road is a road that is passable all year round by the prevailing means of rural transport (typically a pick-up or a truck which is not four-wheel-drive).