In the early days of auto racing a second person was used as a spotter to look for other vehicles and check the gauges. All that changed when Ray Houron won the inaugural Indy 500 in great part to his stunning new invention, the rear view mirror. This eleminated the weight of the extra person and began a tradition that is still used to this day.
Also, in 1922 Barney Oldfield installed a major safety device in his car, the seat belt. About a quarter century later the factories in Detroit took notice and started to instal them their vehicles.
Fuel additives, tire technology, disc brakes? Yep, you guessed it! All invented to make race cars run smoother and safer. Thanks to these speed hungry technichians many of these inventions can be found in your driveway!!
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Drive safely everyone!