>>1143139First time I see that layout, and I don't think making left turns marginally quicker justifies the expense of reshaping the entire intersection. All the other directions and turns are just as slow as on a regular intersection.
Also you now need two parallel left turn lanes, whereas on a regular highway ramp intersection the left turn lanes both fit into one lane with a division in the middle of the bridge if you know what I mean. A bridge that used to be five lanes wide would now need to be six lanes wide.
