 The A470 road is the main North – South Wales route running from Cardiff Bay to Llandudno via exits for the suburbs of Tongwynlais and Taff's Well.The A470 is a major road within the city that provides an important link with the Heads of the Valleys road, Mid and North Wales.As with many other cities car traffic has caused congestion problems and as such the council has designated bus lanes to improve transport into and out of the city centre.