According to the CDC


Falls accounted for 47% of all TBI-related ED visits, hospitalizations, and deaths in the United States

Being struck by or against an object 15% of TBI-related ED visits, hospitalizations, and deaths in the United States .

Motor vehicle crashes is the third leading cause at 19% of all TBI-related ED visits, hospitalizations, and deaths in the United States

Source : (https://www.cdc.gov/traumaticbraininjury/get_the_facts.html)