Motorcycles in the context of "Bajaj Auto"

A driver's license, driving licence, or driving permit is a legal authorization, or a document confirming such an authorization, for a specific individual to operate one or more types of motorized vehicles—such as motorcycles, cars, trucks, or buses—on a public road. Such licenses are often plastic and the size of a credit card, and frequently used as an identity card.

In most international agreements, the wording "driving permit" is used, for instance in the Vienna Convention on Road Traffic. Different regions use variations of the terms driver/driver's/driving permit/license/licence – see sections below for the term used in each region.

The Tyndall effect is light scattering by particles in a colloid such as a very fine suspension (a sol). Also known as Tyndall scattering, it is similar to Rayleigh scattering, in that the intensity of the scattered light is inversely proportional to the fourth power of the wavelength, so blue light is scattered much more strongly than red light. An example in everyday life is the blue colour sometimes seen in the smoke emitted by motorcycles, in particular two-stroke machines where the burnt engine oil provides these particles. The same effect can also be observed with tobacco smoke whose fine particles also preferentially scatter blue light.

Under the Tyndall effect, the longer wavelengths are transmitted more, while the shorter wavelengths are more diffusely reflected via scattering. The Tyndall effect is seen when light-scattering particulate matter is dispersed in an otherwise light-transmitting medium, where the diameter of an individual particle is in the range of roughly 40 to 900 nm, i.e. somewhat below or near the wavelengths of visible light (400–750 nm).

Automotive engineering, along with aerospace engineering and naval architecture, is a branch of vehicle engineering, incorporating elements of mechanical, electrical, electronic, software, and safety engineering as applied to the design, manufacture and operation of motorcycles, automobiles, and trucks and their respective engineering subsystems. It also includes modification of vehicles. Manufacturing domain deals with the creation and assembling the whole parts of automobiles is also included in it. The automotive engineering field is research intensive and involves direct application of mathematical models and formulas. The study of automotive engineering is to design, develop, fabricate, and test vehicles or vehicle components from the concept stage to production stage. Production, development, and manufacturing are the three major functions in this field.

Wire wheels, wire-spoked wheels, tension-spoked wheels, or "suspension" wheels are wheels whose rims connect to their hubs by wire spokes. Although these wires are considerably stiffer than a similar diameter wire rope, they function mechanically the same as tensioned flexible wires, keeping the rim true while supporting applied loads. The term suspension wheel should not be confused with vehicle suspension.

Wire wheels are used on most bicycles and are still used on many motorcycles. They were invented by aeronautical engineer George Cayley in 1808. Although Cayley first proposed wire wheels, he did not apply for a patent. The first patent for wire wheels was issued to Theodore Jones of London, England on October 11, 1826. Eugène Meyer of Paris, France was the first person to receive, in 1869, a patent for wire wheels on bicycles.

Zhejiang Geely Holding Group Co., Ltd. (ZGH), commonly known as Geely Holding (/ˈdʒiːli/ ; Chinese: 吉利控股; pinyin: Jílì Kònggǔ), is a Chinese multinational automotive conglomerate headquartered in Hangzhou, China. The company was founded by, and is privately owned by Chinese entrepreneur Li Shufu.

Geely was founded in 1986 as a refrigerator parts company, before transitioning to motorcycles in 1994 and entering the automotive industry in 1997. ZGH as a holding company was founded in 2003. As of 2023, the company ranks 225 in the 2023 Fortune Global 500 list of the world's largest companies. In 2024, the group produced a total of 3.33 million vehicles globally, including 1.48 million plug-in electric vehicles.