Published: Mar 21, 2013 10:48 AM EDT

WESLEY CHAPEL, Fla. (AP) - The Florida Highway Patrol says a major crash involving two commercial vehicles has closed southbound lanes of Interstate 75 north of Tampa.
    
Troopers say crash happened about 6:30 a.m. Thursday just north of State Road 56 in Pasco County. It will take crews until at least 6 p.m. to repair damage to the highway. One northbound lane was open Thursday morning.
    
Troopers say a tractor trailer crashed into a guardrail, causing it to partially jackknive and hit the center median. A dump truck following behind crashed into the truck. The drivers were able to get out of both vehicles, which caught fire.
    
FHP says the U.S. Postal Service is on the scene to recover mail that was being carried by the truck. Much of the mail was damaged or destroyed.

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