The female driver, known only as Kisa, claims the Hairspray star hit her Toyota Corolla car while driving a black BMW on Los Angeles' Ventura Boulevard on 4 August (12) and then drove away from the scene.
She filed a complaint with police and Bynes was subsequently charged with two counts of hit-and-run, the other count relating to another crash back in April (12), while the actress has also had her licence suspended.
Kisa now tells TMZ.com, "Someone could have died if (Bynes) kept driving. A normal person would not get away with hit and runs and she shouldn't either... I'm glad she's off the road. She absolutely needs to pay for her actions and taking away her licence is a good first step... I feel she needs to get some sort of help and maybe this will be the catalyst."
Bynes is due in court on 27 September (12) and faces a year behind bars if convicted.