A Miami-Dade police officer shoots a man during a traffic stop on I- 75 near Miami Gardens Drive.

It happened as the officer was driving home from work.

Police say the officer, who is a 26-year veteran of the department, saw two speeding cars on  the northbound side. 

He conducted a traffic stop on one of the vehicles and signaled for the other vehicle to stop.

That one came right at him- so he shot the 23-year-old driver --airlifted to a trauma center.

An investigation's underway.

Christopher Furlong / 2012 Getty Images.