Looks like they go to … ships and a terminal. Here’s the Google Map if you want to poke around, and here’s a quick screencap:
Red arrow in the screencap shows roughly the direction of the camera from the video. The drivers entering from the bottom of the video are coming out of the roundabout. Looks like the left “ships” lanes continue on the serpentine yellow path toward the piers where the ferry ships are, and the right “terminal” lane goes into that white loop that leads up to a terminal building (easier to pick out the building on satellite view than in the screencap map).
