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I would check with the local DOT regulations as they do sometimes vary from state to state as well as in regions where high traffic is often an important consideration when these DOT's formulate their own regulations...
If someones needs more specific infromation or clarification of the regulations, the USDOT Pipelines and Hazardous materials administration's information center web link:
http://www.phmsa.dot.gov/hazmat/info-centerHere is the link to some of the many different regulations with respect to PHMSA:
http://www.phmsa.dot.gov/hazmat/regsHere is the PHMSA's link to it's own HAZMAT safety community:
http://www.phmsa.dot.gov/hazmatHere's an interesting study to say the least:
http://www.phmsa.dot.gov/staticfiles/PHMSA/DownloadableFiles/Files/05H010_Final_Report_12_17_06.pdfIn summary, if you don't know what you're doing by not being properly trained, then you subject yourself to the possible risk of being exposed to a catastrophic failure which may result in one or more fatalities!!! Do you really want to take such an uneducated risk???
Respectfully,
Henry