Brownstown Road is to be closed to traffic for four weeks to allow a major resurfacing scheme to take place.
Transport Minister Danny Kennedy announced the start of a £150,000 major resurfacing scheme.
The scheme will extend from Drumard Avenue junction to the off-slip from Northway.
Minister Kennedy said, “This £150,000 scheme represents a significant investment in the roads infrastructure in the Portadown area and road users will realise the long term benefits from the new road surface along this stretch.”
Preliminary works will start on Monday, July 27, with lane closures in operation during the first week of work.
To help minimise disruption to road users and to meet strict health and safety regulations it will be necessary to have a road closure in operation from Monday, August 3, until completion of the works on August 28.
Roads used in the diversions will include Armagh Road, Northway, Corcrain Road and West Street.
The diversion routes will be clearly signposted. TransportNI and the contractor will make every effort to minimise inconvenience, and would ask that the public exercise caution and patience while the works are in progress.
A TransportNI spokesperson said every effort has been made to programme the works and traffic management to minimise inconvenience to the public.
Motorists, however, should be aware that some delays can be expected and they should allow additional time when planning journeys.
As with all works of this nature planned dates are subject to favourable weather conditions and TransportNI will keep the public informed of any unavoidable change.
For traffic information and news of improvement schemes across Northern Ireland visit: http://www.trafficwatchni.com/home