I’ve spend an unreasonably significant fraction of my life sitting in traffic, particularly along the infamous M4 corridor in England. Now, living in London I’m well acquainted with the various ways traffic jams can form. The ones which result from stuffing too many cars into too tiny streets have an obvious cause. Somewhat more irritating are those forming for seemingly no reason out on the motorway – queueing for ages at a standstill only to suddenly drive away like nothing happened. I’ve spent enough time in this unenviable state that it’s almost (though inevitably not quite) worth dedicating some brain time to thinking about why.