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In this scenario, a 500-gallon IBC containing a Class 8 corrosive liquid is transported on an open-sided flatbed truck. The IBC has the correct UN identification number on orange panels on two opposing sides in accordance with 172.302(a)(2). The identification numbers are viewable from either side of the flatbed.
In this interpretation, PHMSA addresses if identification numbers are required on the front and rear of the vehicle.
In interpretation Ref. No. 13-0206, PHMSA advises that additional markings in 172.331(c) do not apply because the identification numbers on the IBC are visible.