The boy fell off and suffered cuts and bruises Sunday but otherwise was not injured.
Trooper spokeswoman Beth Ipsen tells the Anchorage Daily News the boy has apparently gone for roof rides before, hanging on to bars mounted on the minivan.
The boy told troopers he climbed on to the vehicle as it left his home at Mile 52 Parks Highway about 10 miles north of Wasilla. He lost his grip at Mile 49. The driver continued on.
Another motorist picked the boy up, drove him to a gas station and called 911.
Ipsen says no one has been charged with a traffic violation or crime.
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