In transport, many modes have been defined as
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/bicycles-part-sustainable-transport-system
[2] http://admin.indiaenvironmentportal.org.in/category/author/carlos-f-pardo
[3] http://admin.indiaenvironmentportal.org.in/category/publisher/sustainable-urban-transport-project
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/automobiles
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cycles
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe