Many people still do not have access to an existing and extensive formal railway and road infrastructure, and live in areas that do not have reliable transport.  Aside from cost, a problem shared with other countries, is that our population is generally scattered over large areas.  The consequence is that many find distances to train and bus stations to be too excessive to be of practical use, and what transport there is too unreliable.  Walking and cycling account for about 60% of all human transport, with almost 37% of the population are using road transport.  The use of motor vehicles for passenger transport is the least efficient per passenger, in terms of congestion, energy consumption, and air emissions, but road vehicles have the advantage of point-to-point flexibility, both in terms of space and time.  Private vehicle transport, including cars and motorcycles, account for 19% of journeys taken, while minibus-taxis account for 11.5%.  As has already been implied, differences exist in the levels of access to transport between urban and rural areas.  More people in rural areas travel on foot than in private motor-cars, buses, or minibus-taxis.  Use of private vehicles and taxis, compared as a national average with selected local metropolitan areas, is far lower. The General Household Survey has shown that the majority of households will use the services of a taxi when the travel time to a hospital or a food market exceeds the 14 minute limit. For shorter travel times to a destination most households will travel by foot.