Good Question: Why Do We Use Cloverleaf Interchanges On Roads?

We've all seen the traffic camera shot of a tractor-trailer sprawled out on the highway after trying to take a cloverleaf curve. So, that had WCCO-TV viewer Adam Portner wondering: Why do we use cloverleaf interchanges on interstates? Heather Brown reports (2:26). <br /> <br /> <em>WCCO 4 News At 10 – June 20, 2013</em>