Another couple aspects of the high-5 not mentioned in the video: -it doesn't have any lane merges, you can change from one highway to another without merging,

Another couple aspects of the high-5 not mentioned in the video: -it doesn't have any lane merges, you can change from one highway to another without merging, your bridge just becomes a new lane on the next road -these bridges are very long leading up to the turn, so it displaces a lot of traffic and shifts a lot of the lane changing upstream.