Cars were tearing along streets in Detroit at high speeds of up to 20 miles per hour in the summer of 1917, dodging pedestrians and horse teams, resulting in 31 people being killed in car crashes within two months and many injuries that were not recorded.

1. "tearing along the street at a lively rate, dodging people and teams."
- Detroit News
“In two months that summer, 31 people were killed in car crashes and so
many were injured it went unrecorded.”
“It went as fast as 20 miles per hour”

2. In 1917, Detroit and its suburbs had 65,000 cars on the
road, resulting in 7,171 accidents and 168 fatalities.