A 20-year-old college student from south Forsyth was arrested after an alleged road rage incident on Ga. 400 during which authorities say he pretended to be a federal officer.

William Simpson III of Mantle Ridge Drive was released from the Forsyth County Detention Center on Monday, shortly after he posted a $5,610 bond, according to a Forsyth County Sheriff’s report.

The report said Simpson has been charged with one felony count of impersonating a peace officer, public officer or employee.

The incident began about 2:45 p.m. on Ga. 400 at Exit 13.

According to the sheriff’s report, a 44-year-old Acworth man called 911 to report a Chevrolet Silverado that had been following him too closely and driving aggressively, in and out of traffic on Ga. 400.

The man said the driver of the Chevrolet eventually passed him and held up a sign that had “FBI” on it and yelled, “I am FBI. You need to pull over.”

Instead, the report noted, the man called authorities and stayed on the phone while following the Chevrolet as it got off at Exit 16 and then returned to Ga. 400, traveling south to Exit 14. At that point, sheriff’s deputies pulled the vehicle over.

According to the report, Simpson told deputies he’s a criminal justice student at Georgia Southern University and got the Federal Bureau of Investigation folder at a garage sale.

Simpson said the other driver had “brake checked” him while they were on Ga. 400. While passing the car, he tilted the FBI folder “with the hopes that the other driver would leave him alone.”