Motorists are advised to plan ahead before they travel in the coming months as a series of major road works and lane closures are set to begin on two separate sections of the M4 this summer.
Mae modurwyr yn cael eu cynghori i gynllunio ymlaen llaw cyn iddynt deithio yn ystod y misoedd nesaf gan fod cyfres o waith ffordd mawr a chau lonydd yn dechrau ar ddwy ran wahanol o'r M4 yr haf hwn.