Wrth ddatblygu cynlluniau, dylid canolbwyntio ar leihau allyriadau carbon, peidio â chynyddu capasiti ffyrdd, peidio â chynyddu allyriadau drwy atal cerbydau rhag teithio ar gyflymder uwch, a pheidio â chael effaith andwyol ar safleoedd ecolegol werthfawr.
In developing schemes, the focus should be on minimising carbon emissions, not increasing road capacity, not increasing emissions through higher vehicle speeds and not adversely affecting ecologically valuable sites.