The M23 seems to only exist to serve Gatwick airport. However, once upon a time there were grander plans for this small motorway, that naturally got cancelled. It was all down to that pesky London Ringways project, which had it gone ahead would have resulted in many more motorways and the M23 would have been a bit longer as part of it. We also bump into some sort of wartime bunker, an unexpected surprise. And an abandoned site that has no features left...an expected surprise. In this series we aim to explore what our motorway network is hiding. As we drive along at the 70mph..ish...we simply just wouldn't be aware of what we're missing. This series aims to uncover some of the hidden secrets our motorways have to offer.