As a fun anecdote, my father grew up prior to the time that most cars even came with factory seat belts. Before taking a family trip to Alaska in the 50's, his mother read about them and demanded that her husband install them in the station wagon before the trip. So he bought straps and buckles of some sort from a hardware store, and bolted them on so that all 6 kids would have "seatbelts" for the trip.