While airbags have been an almost ubiquitous safety feature on cars since the 1990s, their origins can be traced back to American engineer John Hetrick in 1952. In the spring of that year, Hetrick, his wife and his seven-year-old daughter were out for a Sunday drive in their 1948 Chrysler Windsor. Cresting a hill, Hetrick encountered a rock in the road and swerved to avoid it.
