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DOT-PHMSA has made available a searchable mobile application for both iOS and
Android platforms to assist shippers, carriers, and other stakeholders to
quickly access information regarding hazardous materials markings, labels and placards. Of course, they quickly say "This application is intended
for general guidance only and should not be used to determine compliance with 49 CFR, Parts 100-185. " which presumably even they don't know what
the right answers are., but it is better than nothing.
First here is the PDF version of the guide to placarding, markings and labeling.
Then download the app here:
The latest version of the Hazardous Materials Markings, Labeling and Placarding Guide includes the following changes: