Roscommon County Council says motorists on the N61 can expect delays for the remainder of the roadworks project between Barrymore and Athlone.
The works to address safety concerns on the road began in early October and it was anticipated the project could take three months.
It's part of the Athlone North Pavement project, as well as the installation of a filter lane and island under the Barrybeg road safety improvement scheme.
Motorists on the route have complained of significant delays in recent days and the local authority says the delays can be expected until mid-December.