I would like help fixing this bridge. It is supposed to be a 6-lane bridge, with 4 main vehicle lanes (2 lanes in each direction, in the center of the bridge) and 2 grade-separated mixed-used lanes for 2-wheelers (motorcycles, scooters, bicycles) and pedestrians (1 lane in each direction, on the outside of the main vehicle lanes). From North to South the lanes would look like this: 1 westbound mixed-used lane, 1 concrete barrier, 2 westbound main vehicle lanes, the middle of the bridge, 2 eastbound main vehicle lanes, 1 concrete barrier, 1 eastbound mixed-use lane. 

https://en.wikipedia.org/wiki/B%C3%A3i_Ch%C3%A1y_Bridge