The A477 ECI is part of the Trans European Road Network which links the rest of the UK and Europe to west Wales and Ireland via the ferry ports at Pembroke Dock and Fishguard. This 9.6km project, bypassing the communities of Llanddowror and Red Roses, comprised the construction of 8.7km of off-line highway, mainly through agricultural land between Pont Newydd Bridge and Red Roses. The eastern section of the scheme requires online access improvements, between St Clears and Pont Newydd. Environmental constraints on the route include sites of both National and European significance including the Carmarthen Bay and Estuaries SAC.