Automobiles in the 1920
The automobile industry in the 1920's was rapidly growing and was mostly controlled by Henry Ford.
Henry Ford's company was building new and improved models each year. They were also becoming more affordable since more affordable models were being produced and wages were also rising.
As the 1920's continued more cars makers started to show up like Chevrolet, dodge, Lincoln, Cadillac, Oldsmobile to name some popular ones. But in 1927 what is believed to be the biggest event in the 1920's for automobiles was when Henry ford release the ford Model A which replaced the model T that had been dominating the industry for 18 years which in 1924 accounted for half of the worlds cars sales.
Many cars we think of modern today were also being invented in the 20's like electric cars and hybrid/flexible fuel cars. Cars continued to improve in the 20's with the introduction of heaters, shock absorbers and better interiors. And of course it did not take long for insurance companies to see the value of providing insurance on automobiles. And this was good since there was around 43 companies producing cars by 1929.
In 1923 GM sold 800,000 vehicles making a profit of more then 80 billion dollars. Which worried Henry ford because he was dominating the car business at the time but he saw GM's potential. So he began to think about using interchangeable parts on cars to reduce costs. So instead of one person building a car form beginning to end he thought that he could train one person to do a specific part of the car and then it would be passed to the next. By 1914 the cost of the model T had been reduced to $490 and by 1921 it was down to $310.
Henry Ford's Model T
With automobiles becoming more common roads had to improve and move away from being made of wood and dirt.This is why cars had to have to have a lot of ground clearance and skinny tires because in the mud this made it easier to travel. instead concrete was being used to make the road less bumpy to make it more enjoyable to drive on. Also laws had to be made in order to prevent crashes. So traffic lights and road signs started to pop up in large city's.
http://l3d.cs.colorado.edu/systems/agentsheets/New-Vista/automobile/
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Good but no personal thoughts!