<P> Drivers under 18 are usually required to attend a comprehensive driver's education program either at their high school or a professional driving school and take a certain number of behind the wheel lessons with a certified driving instructor before applying for a license . Some states like New York also require new adult drivers to attend some form of driver's education before applying for a license . </P> <P> However, in some states all newly licensed adult drivers may be on probation for a set amount of time (usually between six months and two years), during which traffic violations carry harsher penalties or mandatory suspensions that would not normally apply to experienced drivers . </P> <P> According to federal law, the minimum age to operate a commercial vehicle in interstate transit is 21; as a result the minimum age to apply for an unrestricted commercial driver's license is 21 . </P> <P> Driving a school bus also requires a CDL, however the minimum age to drive a school bus is typically higher, usually 25 . Some states issue restricted intrastate commercial driver's licenses, valid for operating commercial vehicles in that state only, to drivers aged 18 and older . Professional drivers who are aged 18--20 typically cannot be licensed to drive tractor trailers, hazardous materials, or school buses . </P>

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