Why is gravel so popular?

Gravel racing has become hugely popular in the last few years and it all started in the US. To find out more about the US gravel scene, how it compares to the rest of the world and find out if the racing is getting too serious and whether the future is bright for the sport, I chatted with Ben Delaney, a Colorado-based cycling journalist with over 20 years experience and a regular at gravel events across the US