FULTON COUNTY (WAOK/AJC) - Police in S. Fulton county say a taxi driver died after crashing his cab into a tree, when he ran off of an I-85 ramp at Riverdale Road, Monday night. Investigators say they believe the accident happened after the driver, identified as 30 year old Karl Green got into some kind of altercation with a female driver. Police say they have surveillance video that shows Green talking with a woman outside a gas station on Old National Highway, prior to the crash. They say what happened after that is confusing, other than, the two drivers may have been chasing one another, but it’s unclear who was in pursuit. The woman, who authorities say was drving a SUV, claimed she had back and neck injuries after Green rear ended her car.