​​​Using an Experimental Traffic Regulation Order (ETRO), we can introduce an experimental scheme and try it out before making it permanent.
​​​​​​​​​​Gan ddefnyddio Gorchymyn Rheoli Traffig Arbrofol (GRhTA), gallwn gyflwyno cynllun arbrofol a rhoi cynnig arno cyn ei wneud yn barhaol.