When I was a courier, before dash cams I chased down two hit and run cars. Being in an inconspicuous delivery car, I just followed them until they stopped to check the damage on their car. I rolled up behind them and got the license plate number, car make/model and color and a description of the driver. As they looked at me in shock that they were caught I wave and drive off. Drove back to the scene and shared the info. One of them called the police and confessed the other one they caught.