A temporary contraflow will be introduced for the Gibraltar Tunnels from next week.
The tunnels will be down to one carriageway for two nights from next Monday between 7pm and 6am.
Traffic Wales said a contraflow agreement will be in place to carry out maintenance and survey works in both tunnels.
Appeal to locate Herefordshire man who failed to appear at court
Traders frustrated as road closure extended
Wins for local firms among new highways contracts
Hereford restaurant seeks licence again
Scam websites posing as Hereford firm shut down
Farm plans fourth poultry shed
Free 30-minute parking scheme launches in Herefordshire
Prolific shoplifter jailed for Herefordshire offences