The National Highway Traffic Safety Administration said Monday that it finalized the rule, which also requires enhanced warnings when front seat belts aren't fastened. The agency estimates that the new rule will save 50 lives per year and prevent 500 injuries when fully in effect, according to a statement. The new rule will apply to passenger cars, trucks, buses except for school buses, and multipurpose vehicles weighing up to 10,000 pounds. MORE: https://www.wthr.com/article/news/nation-world/passenger-vehicle-seatbelt-alarms/507-704152c6-312b-4ea6-b9d8-b8e71bdbdfe3