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When must a white-bottom COMBUSTIBLE placard be used to display an identification number?

April 26, 2017combustible display Identification placard Used

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When must a white-bottom COMBUSTIBLE placard be used to display an identification number?

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According to 49 CFR §172.332(c)(4), it must be used during transportation by rail and may (permissive) be used during transportation by highway. J. J. Keller’s Hazardous Materials Regulations Guide includes information about this regulation.