A far-ranging transformation of the Irish capital’s transport network has been outlined by the country’s National Transport Authority (NTA). The overall cost of the project would be €1bn.

NTA figures show that average traffic speeds on the main roads during morning rush hour is fallng from 39.kmh to 33.7kmh. The number of cars paying the toll on the M50, Ireland’s busiest motorway, is also rising by 18 per cent.