There will be an increase in emissions as a result of higher vehicle speeds: as noted above it is predicted that traffic speeds will increase by about 6-11%.
Bydd allyriadau'n cynyddu am y bydd cerbydau'n teithio ar gyflymder uwch: fel y nodwyd uchod, rhagwelir y bydd cyflymder traffig yn cynyddu tua 6-11%.