JACKSONVILLE, Fla. -- On a closed course, near J. Turner Butler and Kernan boulevards, a group of men gathered with cameras in hand.

Ken Harmen, with the Institute of Police Technology and Management got behind the wheel of a light blue car and hit the gas.

The car sped down the course in a straight line. Then, the car slammed into a mannequin.

The mannequin flew up in the air, then slammed hard into the earth.

It was all part of a twice a year class. Police officers and private re-constructionists learned investigative practices and tools for when someone is hit by a car.

Harmen said theories students have learned in the class thus far were being tested.

"One is how close does the first debris land to the point where the pedestrian was standing when they got hit," he said.

The other theory was the math models used to figure out how fast the vehicle was going, based on how far the mannequin is thrown.

"People say 'Geez... I really didn't know I'd hit anything' when they hit pedestrians. How could you not, based on how loud that was?" He said as he drove the car.

Harmen said the class gives authorities even more tools in understanding how to investigate, reconstruct and solve a deadly crash.

"For example, what direction was the pedestrian walking before he gets hit?"