The M3 motorway is around 61 miles in length and runs from London to Southampton. In this episode we'll be taking a trip down south and on our journey we'll discover 300 year old structures, abandoned theme park rides, secret junctions and abandoned slip roads. What a delight. 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.