Editing Semi-trailer truck (section)

===United States===
Drivers of semi-trailer trucks generally require a Class A [[commercial driver's license]] (CDL) to operate any combination vehicles with a [[gross combined weight rating|gross combination weight rating]] (or GCWR) in excess of {{convert|26000|lb|kg|-2|abbr=on}} if the [[gross vehicle weight rating]] (GVWR) of the towed vehicle(s) is in excess of {{convert|10000|lb|kg|-2|abbr=on}}.<ref>{{cite web |title=10 Tips for Semi-Truck Drivers Obtaining Their CDL License |url=https://www.5startrucksales.us/10-tips-for-cdl/ |website=5 Star Truck Sales |date=7 June 2024 |access-date=5 May 2025}}</ref> Some states (such as [[North Dakota]]) provide exemptions for farmers, allowing non-commercial license holders to operate semis within a certain air-mile radius of their reporting location. State exemptions, however, are only applicable in intrastate commerce; stipulations of the Code of Federal Regulations (CFR) may be applied in interstate commerce.  Also a person under the age of 21 cannot operate a commercial vehicle outside the state where the commercial license was issued.  This restriction may also be mirrored by certain states in their intrastate regulations.  A person must be at least 18 in order to be issued a commercial license.

In addition, ''endorsements'' are necessary for certain cargo and vehicle arrangements and types;

* H – [[hazardous materials|Hazardous Materials]] (HazMat or HM) – necessary if materials require HM placards.
* N – Tankers – the driver is acquainted with the unique handling characteristics of liquids tankers.
* X – Signifies Hazardous Materials and Tanker endorsements, combined.
* T – Doubles & Triples – the licensee may pull more than one trailer.
* P – Buses – Any Vehicle designed to transport 16 or more passengers (including the driver).
* S – School Buses – Any school bus designed to transport 11 or more passengers (including the driver).
* W – Tow Truck