|Distance:||4.6 miles (7.4 km)|
|Meets:||A4161, A4234, A470, A4119, A4055, unclassified|
|Former Number(s):||A4055, B4260|
|Route outline (key)|
The A4160 follows a winding route from Cardiff to the coastal town of Penarth.
The road starts at traffic lights on the A4161 Newport Road and heads south along the D2 Fitzalan Place. At the far end it TOTSOs right at traffic lights to run past the prison. The road briefly becomes S4 to go under the railway line south of Queen Street station, then the central reservation comes back as we skirt the southern side of the city centre shopping area. The road TOTSOs left at the next set of lights to follow an S2 road, Bute Street, under the railway line east of Central station, to reach the A470 on Callaghan Square.
The A470 and A4160 cross each other on Callaghan Square, each entering at one corner and leaving at the opposite. We head west along Tresillian Way and briefly become D2 to cross the River Taff. The road now runs through the suburb of Grangetown, lined with terraced houses. The A4119 is crossed at traffic lights and soon we go under two bridges carrying the railway line to Penarth by Grangetown station. On the far side we leave the houses behind and go through an industrial estate. The road then goes over the River Ely and under the A4232 with no junction.
The road becomes semi-rural as it passes Llandough parallel to the railway line. The A4055 is crossed at traffic lights, after which we pass between Cogan station and a retail park. The road becomes residential again and we go under the railway line to pass a park and enter Penarth. We head east along Windsor Road into the town centre then bear right at a roundabout onto Stanwell Road. We end at traffic lights, with all other directions being unclassified.
The A4160 was formed out of two classified roads: the original route of the A4055 from Cardiff to Grangetown; and the B4260, which ran from Llandough to Penarth. These two roads never met, however, as the connecting road across the marshes was a toll road and therefore could not be classified under the original rules. In 1935 the whole thing came together as the A4160, including the previously unclassified section. Road improvements in Cardiff in more recent years have given the road its current route there.