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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).

WCCO 4 News At 10 – June 20, 2013