The Big Diesel played the role of Big Samaritan yet again this week ... Shaquille O'Neal stopped to help a stranded driver in Florida -- and the cool act was all caught on police vid.
According to the Alachua County Sheriff's Office, a person had crashed their car on I-75 in the Gainseville area Monday when Shaq witnessed it and sprang into action.
Cops say the former NBA superstar -- who has a home in Florida -- hung out with and comforted the driver until officers arrived on the scene.
In police footage from the accident, you can see the 7-footer clear as day when cops rolled up .