public nature of government works projects. As a result, transportation planners play both a technical and a coordinating role. Politicians often have vastly differing perspectives, goals and policy desires. Transportation planners help by providing information to decision makers, such as politicians, in a manner that produces beneficial outcomes. This role is similar to transportation engineers, who are often equally influenced by politics in the technical process of transportation engineering design. Integration with urban planning Transport isochrone maps are a measure of accessibility which can be used by urban planners to evaluate sites. See also American Planning Association (U.S.) Bicycle transportation planning and engineering Congestion management agency Fossil fuel lobby Green transport hierarchy Pedestrian zone Low-emission zone List of planning journals Permeability (spatial and transport planning) Professional transportation planner (U.S.) Transportation engineering Strategic environmental assessment Transport planning professional (UK) Urban freight distribution References General Kemp, Roger L., Cities and Cars: A Handbook of Best Practices, McFarland and Co., Inc., Publishers, Jefferson, NC, USA, and London, England, UK, (2007). (). External links Spatial Decision Support Knowledge Portal Urban planning