That's determined by the use.
Yes
Hello, Mechanics need these numbers because that...
No
There are training classes in trade schools a person would have to complete to become DOT certified to inspect semi trucks. There is also a universal DOT test that a person must pass before they can be hired for the position of DOT inspector.
does DOT require inspections on chemical hoses used to unload tank trucks.
Laws on this vary by state. Inquire with your state's DMV.
There are many places where one can find more infromation about dot numbers. One can find more information about dot numbers at popular on the web sources such as FMSCA and The Truckers Report.
There were 6.6 million accidents recorded by the US DOT in 2010. Bucket trucks are safe if you are smart with them but accidents happen everywhere around the world.
Commercial trucks with a Gross Vehicle Weight Rating of 10,001 lbs. or more. So, basically, a one ton pickup and larger, when used for commercial purposes.
If it was 1 one dot cube, you could only roll 1 number. If it was one dot cube. You could roll 6 numbers.
The dot between different numbers or symbols is used for multiplication.