Question from previously unknown contact on April 2, 2015 through the Contact Me page of my website:

Placard on Cargo Tank Motor Vehicle for UN1866 Resin Solutions

Good morning, to my understanding I’ve known that we need placards on flammable over 1000 lb.  But when we have 324lb. of 4.1 Flammable and 525 lb. of UN1866, resin solution.  Is it ok to use Dangerous only or both placards? Tks!

My reply later that same day:

The Dangerous Placard can be used in a variety of situations – with limitations – when transporting HazMat

Thank you for contacting me.  I will try to answer your question below:

• You are correct that vehicles transporting quantities of most HazMat, including Class 3 Flammable Liquids, of ≥1,001 lbs must display HazMat Placards on all four sides of the vehicle.
• The amount of HazMat you describe is not enough to require placards to be displayed on the vehicle (324 lbs + 525 lbs = 849 lbs).  Though the driver may display placards in this instance if he wishes to.  Please read this article:  Driver Option to Display Placards When not Required.
• If displaying placards at the driver’s discretion or if there is enough HazMat to require placarding the vehicle (e.g. 501 lbs of Division 4.1 Flammable Solid and 500 lbs of Class 3 Flammable Liquid) the driver has two options:  1.  Display the distinct placards for the separate HazMat (4.1 Flammable Solid & 3 Flammable Liquid) or; 2.  Display the Dangerous placard alone.  Please read this article:  Use of the Dangerous Placard for Shipments of HazMat.

The display of the Class 3 Flammable Liquid placard is required for certain shipments of HazMat

Also, for general information about acceptable display of placards, please see this article:  What’s Wrong With These Pictures? Incorrect Display of Placards.

Another satisfied HazMat Shipper(April 2, 2015):