The M73 distributes traffic between three of Glasgow’s most important approaches, and provides a key link in the north-south drive through Scotland’s central belt, but its main purpose is to help people avoid Glasgow.
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.
The UK has been driving in circles for a hundred years now, and this humble road junction has become part of British culture. Just what is so special about roundabouts?