On 10/15/2014 6:46 AM, herb white wrote:
What do all those numbers on trucks mean? Such as 1203 for gasoline and where can I find a list of the numbers? It would be nice to know


They are Department of Transportation, DOT, hazardous chemical
designations. Google up DOT UN numbers for specific numbers.
Depending how hazardous the material, the quantity will require putting
the number on the transport or package. Most chemicals below one gallon
don't require them.

http://en.wikipedia.org/wiki/Lists_of_UN_numbers

I've worked with these things and always figured less than one percent
of the public would recognize their significance. Emergency responders
should and should carry lists as number itself is meaningless.

DOT placards will also contain symbols for flammability and toxicity etc.