August Fruehauf, founder of the Fruehauf Trailer Company, is credited with the invention of the semi-trailer and the automatic semi-trailer coupling – designs that are still in use around the world.

1914
August Charles Fruehauf builds the first “semi-trailer.”

1926
Fruehauf Trailer Co. invents the automatic semi-trailer fifth wheel, in which the coupling and uncoupling was accomplished by one man, using the motion of the trailer itself.

The engine brake (aka Jake Brake), invented by Clessie Cummins to enable diesel trucks to maintain a controlled speed when descending steep grades, is offered for sale.

The introduction of radial tires into the trucking industry was a significant milestone in technological evolution – tire replacement and fuel consumption were reduced, which allowed for longer hauls of freight and decreased vehicle maintenance costs.

1915
Charles H. Martin files a patent for the fifth wheel invented by Herman G. Farr. Arthur Savage patents the radial tire.

1952
Michelin develops the first commercial radial truck tire in Europe.

George B. Selden patents the first automobile using internal combustion, based on the Brayton Ready Motor in 1878.

Henry Ford installs the first moving assembly line (1913), making mass-produced vehicles viable.