M74

Markerposts are meant to start at one end of a road and count the kilometres to the other. But things are never that simple.

Even in the 1960s heyday of roadbuilding, some people said you could never build your way out of congestion. Glasgow had plans to prove them wrong.

What sound at first like a pair of forgotten country lanes turn out to have had a major part to play in the history of Scotland's roads.