Emergency crossovers on the interstate are legal in Tennessee for:

Making a U-Turn when you missed your exit.
Emergency vehicles and highway maintenance crews only.
Turning around when no other vehicles are present.
Explanation

In Tennessee it is illegal to make make a U-turn on an interstate highway, except for emergency vehicles and maintenance crews. Due to the fast-moving traffic on interstates, making an unauthorized U-turn could cause serious accidents and obstruct the flow of traffic.

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