Question Of The Day: Why Do Semi Trucks Have 18 Wheels?
So, how did 18 wheels become a standard for semi trucks? One word: containerization.
Decades before 18 wheelers were blowing by on their way to Walmart, cargo was shipped around the world as break bulk. Instead of everything placed within a single container, break bulk shipping meant cargo would be loaded onto a boat or truck individually. The shipping method was tedious and labor intensive, and each time a ship would stop on its route, every item would be moved around to accommodate more cargo. Finally, offloaded cargo would be stored in a warehouse before trucks came to bring those goods to their final destination. It was not the most efficient means by any measure.
(Yahoo.com)
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