TMZ Sports has obtained footage of Fournette being arrested at the Easy Breezy Car Wash in Jacksonville ... where multiple cop cars responded to the situation.
A witness -- Kevonte Williams aka KazeThePharaoh -- tells us Fournette was driving a GMC Denali when he was pulled over by police.
When Fournette was taken out of the car, he was handcuffed and placed in a squad car while multiple witnesses shouted at the police, "Free Fournette!"
Eventually, Fournette was driven to a nearby station where he was booked. A friend of the NFL star drove the Denali away from the car wash.