Inch of the following scenarios would the national highway traffic safety administration be involved in ?

I believe the answer is: investigating the use of a faulty gearbox in a semitrailer, modifying the fuel efficiency standards for new cars

The National highway traffic safety administration was created with the purpose to prevent potential accidents from happening in united states roads.
Their job description includes road maintenance and maintaining standard regulations for the type of vehicles that can operate

Since the time there were born it depends, there's fun violence, abuse, r@pe, kidnappings, threats, hostages ect.