Keep a Window Breaker and Seatbelt Cutter Within Arm's Reach

In a submerged car or after a bad crash, a jammed seatbelt or sealed window becomes a death trap in seconds. A spring-loaded window breaker and seatbelt cutter combo tool costs about $10 and clips right to your sun visor — within arm's reach without searching. Keeping it in the glove box defeats the purpose: in an emergency, you need it instantly. Buy one for every car in your household and show every driver where it is.