Urban flight often leads to suburban sprawl—low population density in developments that appear outside a city. Homes typically get larger the farther they are from the city, and residents have a larger ecological footprint (larger homes and more time spent driving). The suburbs now have their own suburbs—the exurbs, which are commuter towns that are beyond the traditional suburbs but whose residents still commute into the city, often an hour or more each way. Both suburbs and exurbs often displace farmland and wildlands.