What causes racial disparity in Cincinnati police traffic stops?

After multiple WCPO 9 I-Team investigations dating back to 2016 found that Cincinnati police pull over black motorists more often than white motorists, city leaders say the disparity isn’t a result of racial bias and the 2002 Collaborative Agreement to correct policing is working. Instead, the traffic stop trend is based on calls for service in areas that happen to have more people of color, officials say.