There are several causes of traffic congestion including rapid population growth, overreliance on automobiles, and failure to expand road infrastructure. Long-term causes include concentrated work schedules and a preference for low-density housing and workplaces that require automobile commutes. This leads to exasperating traffic conditions for citizens and economic inefficiency from lost time spent in traffic. Effective transportation planning requires coordinating land use and transportation to serve high density areas and improve access, while guiding development towards growth areas.