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The Ottawa Herald, Jeanny Sharp) NO SALES, Associated Press
In a Sunday, April 1, 2012 photo, the wreckage of a box truck that was pulling a trailer lies in a ravine after it hit a guardrail and a concrete bridge, near Williamsburg, Kan. Authorities said 18 people were inside the vehicle, which had living quarters inside, when it crashed, killing five. A family friend said a Minnesota family and some friends were taking a spring break vacation to see a motocross race.

KANSAS CITY, Mo. — A converted semitrailer that crashed on a Kansas highway and killed five people was driven by a 17-year-old boy with a provisional license.

Adam Kerber was behind the wheel of the Freightliner truck when it broke through a guardrail and went into a ravine Sunday morning near Williamsburg, about 70 miles southwest of Kansas City, Mo.

Minnesota authorities say Kerber's license includes several restrictions, including that all occupants of his vehicle wear seat belts where available. Only two of the 18 people aboard were belted in, but it wasn't clear if belts were available for those passengers riding in the trailer.