The A4232, known as the Peripheral Distributor Road (Welsh: Ffordd Ddosbarthu Ymylol) or Cardiff Link Road (Ffordd Gyswllt Caerdydd), is a distributor road in Cardiff. The first section to be completed was the Southern Way Link Road in 1978 and the last section was the Butetown Link Road in 1995. The final section, the Eastern Bay Link Road, is yet to be built, with no date when construction may start. When fully completed, the road will form part of the Cardiff ring road system. The A4232 runs west, south and east of Cardiff, with the M4 motorway between junction 30 and junction 33 completing the northern section. The A4232 is dual carriageway for its entire length except for the East Moors Viaduct, which is a single carriageway.
The A4232 has been constructed in separate link roads of between 1.61 km (1.00 mi) and 5.47 km (3.40 mi) around Cardiff and to date 22 km (14 mi) including spurs have been opened to traffic, with plans for a further 5.53 km (3.44 mi). It has four large viaducts (Ely Viaduct, Grangetown Viaduct, Taff Viaduct and the East Moors Viaduct), one tunnel (Queen's Gate Tunnel) and two spur roads (Cogan Spur and Central Link Road). The road also has many smaller bridges over or under most of the interchanges on the road. The entire length of the road has clearway restrictions on it.