FYI, in the indoor queue, guests will see two video screens that explain how to load the vehicles, before load. One part of the screen says left for sidecar, right for motorbike. As
@Alicia explained, riders are given a card before entering the last leg of the queue. The card indicates sidecar or motorbike. I decided I would ride in the sidecar. The guy I was next to in line preferred the motorbike*. After we passed the TM handing out the cards, we encountered the last queue that was divided down the middle with dark blue paint (or tape?). I stood to the left of the line but was confused because no one else was standing in front of me - everyone was to the right of the line. A TM was beckoning me to move forward, saying, "Sidecar, sidecar," and that took me to the front of the line.
It was confusing because I was like, does that mean everyone else in that other line really wanted the motorbike? Maybe? It also meant I did not ride with the guy I intended to ride with (which is fine because I was a party of one when I entered the queue). I was happy because it allowed me to ride much faster, but I wonder why the left and right queues were so lopsided. If there were parties of two together, did they not realize that if everyone wants to ride on the motorbike, they wouldn't be riding side-by-side? Just some thoughts.
*In addition to the tech delays and not functioning at full capacity, another element that may have added to the long wait times yesterday was because around the time I was in the last queue room, the TMs were having every person test out the test seats.