One of the loneliest books in the world might just be your vehicle's owner's manual. Consigned to the glove box, many never see the light of day until they find a new home in the recycle bin. That's a shame because the manufacturer of your vehicle has put a lot of thought and important safety information on those pages.
The most basic piece of safety equipment to appear in the owner's manual was likely the seatbelt. Mine shows pictures of how to wear it properly, warns of what could happen to me if I did not and explains on how to care for it. Proper use of the seatbelt is extremely important if your vehicle is equipped with airbags.