Mae cynlluniau ar gyfer terfyn cyflymder diofyn o 20 milltir yr awr ar ffyrdd Cymru wedi symud gam yn nes wrth i wyth ardal beilot i dreialu'r newid gael eu cadarnhau.
Plans for a default 20mph speed limit on Welsh roads have moved a step closer as eight pilot areas to trial the change have been confirmed.