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.
The wait is over! The full map of the Ringways, London’s unbuilt urban motorway network, is now online. Not even the system's planners had anything like this.
The tale of how British traffic signing developed between the Second World War and the mid-1960s, bringing us from a system designed at the turn of the century to the signs we still use today.