Emergency crossovers on the interstate are legal in Tennessee for:
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Turning around when no other vehicles are present.
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Emergency vehicles and highway maintenance crews only.
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Making a U-Turn when you missed your exit.
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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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This question appears in the following DMV practice tests: