Urban transportation Planning 29 Environmental aspects 19 City planning 17 Local transit 16 Sustainable development 15 Transportation 14 Urban transportation policy 14 Bus lines 8 Social aspects 5 Traffic engineering 5 Transportation engineering 5 Choice of transportation 4 Cities and towns 4 Economic aspects 4 Freight and freightage 4 Land use, Urban 4 Research 4 Transportation, Automotive 4 Case studies 3 Sustainable urban development 3 Air 2 Bar coding 2 Congresses 2 Developing countries 2 Electric automobiles 2 Environmental impacts 2 Finance 2 Intelligent Transportation Systems 2 Land use 2