In the first test, forty-five participants were randomly assigned to watch different videos of a car accident, in which the separate videos had shown collisions at 20 miles per hour, 30 miles per hour, and 40 miles per hour.
Forty-five participants were randomly assigned to watch different videos of a car accident. This was in the first test. The separate videos had shown collisions at 20 miles per hour in a car accident. The separate videos had shown 30 miles per hour in a car accident. The separate videos had shown 40 miles per hour in a car accident.