Which law mandates vehicle manufacturers to include safety features like safety belts?

The National Traffic and Motor Vehicle Safety Act is the correct answer because this legislation was enacted to promote motor vehicle safety and establish federal standards for vehicle manufacturers to follow. Specifically, it mandates that safety features, such as safety belts, must be included in vehicles to help reduce the number of injuries and fatalities resulting from traffic accidents.

This act enabled the creation of the National Highway Traffic Safety Administration (NHTSA), which is responsible for ensuring that vehicles meet safety standards and that manufacturers comply with regulations regarding various safety features. By establishing clear guidelines, this law plays a pivotal role in protecting occupants in vehicles, thereby enhancing overall road safety.

The other options provided do not specifically mandate the inclusion of safety features like safety belts. The National Highway Safety Act, for instance, focuses more on highway safety programs rather than directly on vehicle manufacturing standards. Similarly, the Insurance Institute for Highway Safety Act is an organization that conducts research and testing but does not have the authority to impose such regulations on manufacturers. The No Vehicle Left Behind Act is not a recognized piece of legislation related to vehicle safety at all.