Remove all car traffic from the middle, only bus and bike. Remove the bike lane from Plaza St E & W, possibly the parking too. Make it two lanes of traffic where right lane must turn right.

West bound Eastern Parkway merges to single lane before hitting Plaza St E and is forced to turn right onto Plaza St E. Force south bound traffic on Vanderbilt and Flatbush into a single lane before their turns too.

The lights could probably be timed to send Flatbush traffic around almost non-stop.