I originally started this discussion on steam: My goal was to make a vehicle wait for the player to get in before continuing its journey. I tried a lot of different ways, but the vehicle wouldn't move. I made a video of this problem. With the current setup, the second waypoint is activated immediately as soon as the player gets into the vehicle without having it move.
MATTXYO finally figured out what the problem is: Adding an AI gunner to the vehicle makes the vehicle moves as intended. Without an AI gunner, however, even if the player gets into the vehicle as the gunner, the car won't move.