By Nathan Baker ( November 16, 2021, 2:42 PM EST) -- A person buying a new car in 1970 would scarcely believe that seatbelts would be mandatory safety equipment by the end of the decade. The 90s brought airbags. The 2000s brought back-up cameras in every new car being produced, something that would have seemed technologically impracticable 15 years ago. These safety features tend to be introduced in higher-end vehicles but then end up being adopted as mandatory in the years to follow....