What is NHTSA? Role, initiatives, and vehicle safety ratings

5 stars: Overall injury risk for this vehicle is much less than average.
4 stars: Overall injury risk for this vehicle is less than average to average.
3 stars: Overall injury risk for this vehicle is average to greater than average.
2 stars: Overall injury risk for this vehicle is greater than average.
1 star: Overall injury risk for this vehicle is much greater than average.

What does NHTSA stand for? <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 25" class="_root_1u45k_1 _m_1u45k_16" aria-hidden="true" focusable="false">

What is the highest rating NHTSA? <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 25" class="_root_1u45k_1 _m_1u45k_16" aria-hidden="true" focusable="false">

Is NHTSA only responsible for vehicle safety? <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 25" class="_root_1u45k_1 _m_1u45k_16" aria-hidden="true" focusable="false">