1:24 is a very popular size for Die-cast toy vehicles, which are collected by children and adults. Primarily automobiles are made in this scale, with a few examples of tractor trailers and other larger equipment. Plastic automobile kits are frequently made in this scale.
1:24 is the largest of the traditional slot car sizes - and the earliest. Lionel's (USA) 1:24 electric autos of 1912-1916 became the first known commercial slot cars.[1] In 1955, the Model Automobile Racing Association of Kalamazoo, Michigan, built the first track for electric rail-racing (the short-lived immediate predecessor to slot racing) in the US. Unlike the seminal Southport (UK) track that inspired it, the MARA table was designed for 1:24 as well as 1:32 competition.[2] With that beginning, the US adopted 1:24 as the primary scale for serious competition during the heyday of slot car racing in the 1960s,[3] while Britain and Europe favored 1:32, and have continued to do so.
1:24 scale is very close to the scale (1:22.5) used for European G scale narrow-gauge model trains, so 1:24 models are often used on model train layouts.
Doll houses and furniture are also found in 1:24 scale. An average adult male human figure stands just under 3 inches (76 mm) tall.