The best replacement for seat belts is no seat belts.

The best alternatives to seat belts are rated as following:
★★★★★  no seat belts
★★★★  airbags
★  no seatbelts
★  air bags
★  seatbelts
  helmets
  seat belts
  car seats

Your alternative for seat belts is not listed? Suggest!
Speaking about seat belts, one probably shouldn't forget about air bags.

Other search terms related to seat belts and their ratings are:
★★★★★ air bags
★ racing seats
You have in mind a companion for seat belts and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of seat belts in all years. Click on graph for more.
seat belts
no seat belts
airbags