 Although once being a single continuous route, the A4 nowadays is split into two completely divided stretches.The route branches off from the A3 Lisburn-Armagh road in Portadown and meets the M1 at Junction 12.The A4 the re-appears at the end of the M1 motorway at Junction 15 south of Moygashel, from which point it continues uninterrupted to the border village of Belcoo in western County Fermanagh.