Congress has given statutory authority to the National Highway Traffic Safety Administration (created by an act of congress, the “Highway Safety Act of 1970“), to ensure the safety of our highways and in the usage of motor vehicles.
Similar groups of law dealing with a particular subject are grouped together, or codified into larger tomes in order to aid in the prompt administration of the law.
Under an uncodified provision, congress grants statutory authority to the secretary of the NHTSA to do the following:
The so called Tread Act under section 11, parts a, b, and c to propose rules after studies are done (rulemaking) to guarantee the safety of
1- tire labeling-
2- Inflation levels and load limits
3- Tire Pressure warning
So, basically, this is what happens.
Congress give statutory authority for an executive branch to do something, they give them the overall purpose, and let the individual agency do rulemaking and pass regulation within their statutory powers. The so called “forth branch of our government”, the myriad of agency regulations.
If you go to their website, you will read about these proposed rules, the ones that are adopted, and denied. And so forth.
Forgive me for such informal citing for this is not serious research, my spelling and grammar. Just took five minutes of my time.
Hope it enriches you just a bit.