In 2021, motor vehicle crashes killed an estimated 42,915 people in the United States. The number of fatal traffic crashes represents only a fraction of the total number of crashes which occur on U.S. roadways every year. Chapter 1 discusses the safety of our nationâ s roadways, explore programs and policies included in the Infrastructure Investment and Jobs Act to improve roadway safety, and learn from key stakeholders about their role in implementing these programs and other roadway safety strategies. Chapter 2 evaluates the safety effectiveness of adaptive signal control technologies...