How did a truck crash on top of this Houston freeway sign?

Somehow, the truck's bed's hydraulic arm engaged while driving. Raised up into the air at a nearly 90-degree angle, the empty bed smashed into an overhead beam near the Airline exit, striking a green interstate sign, disengaging itself from the cab of the truck. There the bed sat, seemingly suspended in air, attached to the sign.

Thankfully, the driver wasn't harmed in the late Tuesday afternoon accident.

Houston authorities had to close part of the city's North Freeway while the state cut down the bracing to get the trailer off, leaving hundreds of people stranded in the city's now standard 100-degree heat. The trucking company will have to carry the costs of repairing the damage to the signs, which the state estimates at a cool $100,000.