Work is due to start on the B3098 in Edington, on the Westbury Road to Edington Priory and Lower Road, on March 24.
The existing junction layout will be changed to a T-junction, and a new grass verge and pedestrian footpath installed. An informal crossing will be provided across the junction.
Work will take about three weeks and temporary traffic lights used. From April 22-24 the road will be closed for resurfacing with a diversion set up.