Cymru yw'r wlad gyntaf yn y DU i wneud hyn - gan helpu i achub bywydau, datblygu cymunedau mwy diogel, gwella ansawdd bywyd ac annog mwy o bobl i wneud dewisiadau teithio mwy cynaliadwy a llesol.
Wales becomes the first UK nation to make the move - helping to save lives, develop safer communities, improve the quality of life and encourage more people to make more sustainable and active travel choices.