Commercial driver's license in the context of "Dangerous goods"

A bus (contracted from omnibus, with variants multibus, motorbus, autobus, etc.) is a motor vehicle that carries significantly more passengers than an average car or van, but fewer than the average rail transport. It is most commonly used in public transport, but is also in use for charter purposes, or through private ownership. Although the average bus carries between 30 and 100 passengers, some buses have a capacity of up to 300 passengers. The most common type is the single-deck rigid bus, with double-decker and articulated buses carrying larger loads, and midibuses and minibuses carrying smaller loads. Coaches are used for longer-distance services. Many types of buses, such as city transit buses and inter-city coaches, charge a fare. Other types, such as elementary or secondary school buses or shuttle buses within a post-secondary education campus, are free. In many jurisdictions, bus drivers require a special large vehicle licence above and beyond a regular driving license.

Buses may be used for scheduled bus transport, scheduled coach transport, school transport, private hire, or tourism; promotional buses may be used for political campaigns and others are privately operated for a wide range of purposes, including rock and pop band tour vehicles.

In the United States, driver's licenses are issued by each individual state, territory, and the District of Columbia (a practical aspect of federalism). Drivers are normally required to obtain a license from their state of residence. All states within the United States mutually recognizes licenses from other states for various purposes pertaining to identification and driving status, they are also recognized in Canada for similar purposes. There are also licenses for motorcycle use.

Generally, a minimum age of 15 is required to apply for a non-commercial driver license, and 18 for commercial licenses which drivers must have to operate vehicles that are too heavy for a non-commercial licensed driver (such as buses, trucks, and tractor-trailers) or vehicles with at least 16 passengers (including the driver) or containing hazardous materials that require placards. A state may also suspend an individual's driving privilege within its borders for traffic violations. Many states share a common system of license classes, with some exceptions, e.g. commercial license classes are standardized by federal regulation at 49 CFR 383. Many driving permits and ID cards display small digits next to each data field. This is required by the American Association of Motor Vehicle Administrators' design standard and has been adopted by many US states. The AAMVA provides a standard for the design of driving permits and identification cards issued by its member jurisdictions, which include all 50 US states, the District of Columbia, and Canadian territories and provinces. The newest card design standard released is the 2025 AAMVA DL/ID Card Design Standard (CDS). The AAMVA standard generally follows part 1 and part 2 of ISO/IEC 18013-1 (ISO compliant driving license). The ISO standard in turn specifies requirements for a card that is aligned with the UN Conventions on Road Traffic, namely the Geneva Convention on Road Traffic and the Vienna Convention on Road Traffic.