Parts of the B4246 will be closed for Electricity Power Lines Upgrade between Brynmawr and Gilwern over a period of three weeks.
Bus X4 will operate via the A465 missing out Govilon and Llanfoist.
Bus 3 will serve Govilon but turn at the Blaenavon Road Junction then via A465.
Bus 47 will serve Llanfoist To and from Abergavenny.
King Henry VIII School Bus will operate at the normal times but with a smaller bus.