The M4 into London was one of the UK's earliest and most ambitious motorway projects. It was bold, pioneering... and almost instantly regretted.
An introduction to what I write, and why I write it, and where my strange new road sign simulator fits in to all this.
It was specially designed never to be noticed. And now it's disappearing, nobody has noticed its absence. It's London's own bespoke street light.
Motorways used to be really simple. Now they have electronic signals, variable speed limits, emergency lay-bys, part-time hard shoulders... Just what is so smart about Smart Motorways?
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