37: Pedestrian Airbags
Ever think a car could have an airbag to protect you from the outside? Well, a few engineers had a bright idea for equipping cars with an airbag system outside the vehicle. The idea behind this would be to protect pedestrians and motorcyclists in the event of being run over. The idea isn’t as much of a stretch as you’d think (via Motor Lease).

Car accidents involving pedestrians and motorcycles are some of the most common forms of death. Although the pedestrian airbag never caught on with consumers, it was a novel idea at the time. Fortunately, we won’t see any cars with an exterior airbag system anytime soon.