Bydd wyth ardal beilot lle byddwn yn treialu 20mya ar ffyrdd cyfyngedig  - ffyrdd sydd â chyfyngiad 30mya ar hyn o bryd ac sydd â goleuadau stryd. Yr aneddiadau hyn yw:Y Fenni, Sir FynwyCanol Gogledd CaerdyddGlan Hafren, Sir FynwyBwcle, Sir y FflintPentref Cil-ffriw, Castell-nedd Port TalbotLlandudoch, Sir BenfroSant-y-brid, Bro MorgannwgGogledd Llanelli, Sir Gaerfyrddin
There will be eight pilot areas where we will trial 20mph on restricted roads – roads that currently have a 30mph restriction and have street lighting.  These settlements are:Abergavenny, MonmouthshireCentral North CardiffSevernside, MonmouthshireBuckley, FlintshireCilfriw Village, Neath and Port TalbotSt Dogmaels, PembrokeshireSt Brides Major, Vale of GlamorganLlanelli North, Carmarthenshire