Swansea The A483 begins at the
M4 motorway junction 42, just east of Swansea. It travels west along the
Fabian Way towards Swansea city centre, where it turns to a northwesterly direction. It meets the M4 again at junction 47 at
Penllergaer, after which it
multiplexes with the
A48 along Swansea Road, Bryntirion Road and Bolgoed Road to
Pontarddulais.
Carmarthenshire After Pontarddulais, the route continues along Heol Fforest and Carmarthen Road. It diverges from the A48 at the M4 junction 49, turning northeast towards
Ammanford and then north towards
Llandeilo. At Llandeilo it joins the
A40, then multiplexes with this route as far as
Llandovery. From here, it continues north into Powys.
Powys The A483 continues through
Llanwrtyd Wells,
Builth Wells (where it intersects with the
A470) and
Llandrindod Wells. It intersects with the
A44 at
Crossgates, just north of Llandrindod Wells, then continues to
Newtown. The original route, through the centre of the town, passed under the
Cambrian Line at the Dolfor Road Railway Bridge. This low bridge, with a height restriction of , was hit by high vehicles on many occasions. A bypass to the Southeast of Newtown was opened in 2019, crossing the Cambrian Line to the East of the town before rejoining the original route. From Newtown, the road continues to
Welshpool, running roughly parallel to the
River Severn, before crossing the border into England at
Llanymynech.
Shropshire From Llanymynech, the A483 continues north, bypassing
Oswestry. Here, it picks up a multiplex with the
A5; the two routes then cross into Wales at
Chirk.
Wrexham After the A5 diverges to the west at Chirk, the A483 crosses the
River Dee, then reaches
Ruabon. Here, it becomes a
dual carriageway with numbered
grade-separated junctions. Junction 1 – A539 Ruabon Junction 2 – B5426 Johnstown Junction 3 – A5152 Croesfoel Junction 4 – A525 Ruthin Road Junction 5 – A541 Mold Road Junction 6 – A5156 (A534) Gresford Junction 7 – B5102 Rossett
Cheshire Just south of
Chester, the A483 intersects with the
A55 North Wales Expressway. It then continues as a single carriageway to its terminus at the city centre, crossing the
Grosvenor Bridge over the Dee. ==Future==