Video: Dump Truck Takes Out Highway Sign In Houston

There was an incredible videotape taken in Houston, Texas as a dump truck took out a highway signal on Interstate 610.  The truck was moving with a raised bed and struck the sign, as shown below.

It is not clear why the driver was running with the back raised but the eyewitness attempted to drive along the side to beep his horn and warn the driver.  Obviously it was to no avail.