Saw this on FB this morning from a WDW bus driver. I've traveled around with son in wheelchair different places, not WDW, and didn't know about the thumbs up thing. Of course, it assumes the wheelchair person CAN move their thumbs....
"Please please please if you are in a scooter, wheelchair or special make sure the bus drivers can see you as they approach the load zone. Don't let other guests get between you and the yellow safety line. As the buses approach give the driver a thumbs up if you are going to that park of a thumbs down if not. When the CP's are helping out in the mornings they alert us but when they are not there we need a clear view of you and signal as to whether you are going with us or not"
"Please please please if you are in a scooter, wheelchair or special make sure the bus drivers can see you as they approach the load zone. Don't let other guests get between you and the yellow safety line. As the buses approach give the driver a thumbs up if you are going to that park of a thumbs down if not. When the CP's are helping out in the mornings they alert us but when they are not there we need a clear view of you and signal as to whether you are going with us or not"