The transport system should actively contribute to environmental sustainability by—
(a) protecting, conserving and improving the natural environment;
(b) avoiding, minimising and offsetting harm to the local and global environment, including through transport-related emissions and pollutants and the loss of biodiversity;
(c) promoting forms of transport and the use of forms of energy and transport technologies which have the least impact on the natural environment;
(d) improving the environmental performance of all forms of transport and the forms of energy used in transport.