What is the main purpose of the National Highway Traffic Safety Administration (NHTSA)?

The primary objective of the National Highway Traffic Safety Administration (NHTSA) is to save lives, prevent injuries, and reduce road traffic crashes, which aligns with its mission to enhance road safety. The NHTSA undertakes various initiatives, including conducting research, implementing safety programs, and developing regulations for vehicle safety standards. By focusing on these areas, the NHTSA aims to create safer road environments for all users, thus minimizing the risks associated with driving and reducing the incidence of accidents.

The other options, while related to transportation and vehicles, do not capture the NHTSA's primary mission. For instance, enforcing speed limits, managing traffic lights, and promoting vehicle sales are not core functions of the NHTSA, which instead focuses on broader safety initiatives and research to improve overall traffic safety outcomes.