"Wedi'i gadarnhau gan y cysyniad o ddatblygu cynaliadwy, mae'n rhaid i gynllunio trafnidiaeth ar gyfer y dyfodol nid yn unig oresgyn ei duedd economaidd traddodiadol, ond hefyd fabwysiadu safbwynt eang, holistaidd. Mae'n rhaid i'r pwyslais economaidd sy'n tanlinellu'r angen am ddatblygiadau pellach i'r seilwaith gael eu hystyried mewn perthynas â dirywiad amgylcheddol, yr effaith ar yr amgylchedd a thueddiadau o fewn y gymdeithas.
“Reinforced by the notion of sustainable development, future transport planning must not only overcome its traditional economic orientation, but also adopt a broad holistic, perspective. The economic imperative that underlines the need for additional infrastructure development must be considered in relation to environmental degradation, climatic impacts and societal trends.