With the influx of oil revenue and foreigners, Nigerian cities have grown to resemble many Western urban centers. Lagos, for example, is a massive, overcrowded city filled with traffic jams, movie theaters, department stores, restaurants, and supermarkets. Because most Nigerian cities grew out of much older towns, very little urban planning was used as the cities expanded. Streets are laid out in a confusing and often mazelike fashion, adding to the chaos for pedestrians and traffic. The influx of people into urban areas has put a strain on many services. Power cuts and disruptions of telephone service are not uncommon.