Mr. Padraic Moran:

Yes. There is one in the wheelchair area, which would be level with the arm rest of my chair, that is not covered by plexiglass. It just has a big round button with a picture of a wheelchair on it. When they are armed they light up green and when there is no light it means they are disarmed. They are a mere decoration. There is no point in having them there because I cannot hit it. It does not work. It will not communicate with anyone unless I physically manage to stand up and hit it or ask a passenger to keep the door open until the driver remembers that I am sitting there.