A commercial driver's license (CDL) is a driver's license required to operate large or heavy vehicles.
Beginning the the early 20th century, the 1920's saw several major advancements. There was improvement in rural roads which was significant for the time.The diesel engine, which are 25-40% more efficient than gas engines were also a major breakthrough.We also saw the standardization of truck and trailer sizes along with fifth wheel coupling systems. Additionally power assisted brakes and steering developed. By 1933, all states had some form of varying truck weight regulation.
“Country music scholar Bill Malone has gone so far as to say that trucking songs account for the largest component of work songs in the country music catalog. For a style of music that has, since its commercial inception in the 1920s, drawn attention to the coal man, the steel drivin’ man, the railroad worker, and the cowboy, this certainly speaks volumes about the cultural attraction of the trucker in the American popular consciousness.” — Shane Hamilton
The year 1611 marked an important time for trucks, as that is when the word originated. The usage of "truck" referred to the small strong wheels on ships' cannon carriages. Further extending its usage in 1771, it came to refer to carts for carrying heavy loads. In 1916 it became shortened, calling it a "motor truck".While since the 1930's its expanded application goes as faras tosay "motor-powered load carrier".
Words have always had a different meaning or havebeen usedinterchangeablywith others across all cultures.In the United States, Canada, and the Philippines the word "truck" ismostlyreserved for larger vehicles.Although in Australia, New Zealand, and South Africa, the word "truck" is generally reserved for large vehicles. In Australia and New Zealand, a pickup truck is usually called a ute, short for "utility". While over in South Africa it is called a bakkie (Afrikaans: "small open container").The United Kingdom, India, Malaysia, Singapore, Ireland, and Hong Kong use the "lorry" instead of truck, but only for medium and heavy types.