These are issued by Norfolk County Council and listed on the Highways part of their website as Public Information Notices here https://www.norfolk.gov.uk/roads-and-transport/roads/traffic-orders-notices-and-restrictions/public-information-notices
Notices with maps are posted up in the Parish notice boards for any closures affecting Burston, Shimpling, Mill Green and Audley End.
For other road work information around the UK there is a useful map here https://roadworks.org
If you travel on the A140 there is a closure in Long Stratton for 21st and 22nd May for the new roundabout. STRO2656-LongStratton