Part two of our M4 expedition sees us in that wonderful Wales. It'd be easy to make a cheap remark about sheep, valleys and hills... yet somehow we've avoided that... Join us as we travel the length of the M4 motorway where we'll be looking at various points of interest that are sure to amaze. It's like a video version of "I spy on the motorway" so next time you're on the M4, keep an eye out for some of these unique features... 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.