Why is gravel growing so much?

This week's episode is all about the sport's move onto gravel. Where did it come from? Where is it going? Why does nobody want to race on the road anymore?

Abby chats with Olivia Dillon, who works at Velocio, Jess Cerra, who runs a gravel camp, and Alison Tetrick, the Queen of Gravel, for insight into the groad phenomenon.