The message should be brief and outgoing calls should only be made when the vehicle is parked in a safe, legal place, with the engine turned off.
Dylai’r neges fod yn fyr a dim ond pan fo’r cerbyd wedi’i barcio mewn lle cyfreithlon, diogel, gyda’r injan wedi’i diffodd y dylid gwneud galwadau.