Motorists are being warned of overnight closures for the next 15 nights along the A14 and A11 in Suffolk as new electronic message signs are installed.
The latest work, part of a £70m project, stretches from junction 35 of the A14 and from Six Mile Bottom on the A11 to just east of Bury St Edmunds.
The closures are taking place between 2100 BST and 0600 BST, with diversions being put in place.
The new signs will provide real-time traffic information to motorists.
Fibre-optic cables are being placed along the road and 72 signs are being installed.
The signs will monitor the road, detecting slow-moving or stationary traffic and automatically give messages warning road users of delays.
Journey time information will be available, as well as advice on alternative routes.