The Leeds Inner Ring Road is one motorway with two numbers, designated A58(M) from its western end to Claypit Lane and A64(M) from there to the eastern end.
It was the UK's only single-carriageway motorway, and twenty years ago it ceased to exist. This is the story of the strange fascination it held, and of my place in history.
Today two motorways cross the Severn near Chepstow. But as recently as 1965, the only crossing was a ferry that carried six cars at a time, from Aust to Beachley.