Q:

How often do you need to take refresher courses to maintain your commercial driver's license?

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Each state independently determines the length of time for which a commercial driver's license is valid before requiring a refresher course, according to DMV.org. Traffic violations committed by a CDL holder impact the driver's ability to hold a CDL certification, states the Federal Motor Carrier Safety Administration.

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Full Answer

For example, in Minnesota, commercial driver's licenses expire every four years on the license holder's birthday, reports the Minnesota Department of Public Safety. In Iowa, a commercial driver's license is valid for five to eight years unless the holder is over 72 years old, in which case it is valid for only two years, states DMV.org.

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