Two way roads must not be less than 3.7 metres wide, or if they are designed for and used by one way traffic of 3 metres wide.
Rhaid i ffyrdd dwyffordd beidio â bod yn llai na 3.7 metr o led, neu os ydynt wedi eu dylunio ar gyfer traffig unffordd, dim llai na 3 metr o led.