Get rid of the roads in the center except for the bus lanes. Make Plaza st 2 lanes wide right lane for turns only and left for straight. This means eliminating parking from the circle on at least one side. Restore the plaza st to its oval shap at the south end. at Union street they need to make a right turn from plaza st and move the crosswalks away from the intersections so cars are better able enter plaza st.

This way there will only need 4 traffic lights if at all, at flatbush, union, eastern parkway and Vanderbilt. Traffic will be heavy but constantly flowing so better then it is right now.