What notice could you see in each of these places?

1. on the underground  Keep right
2. in a waiting area in a busy airport 
3. on the door of a hotel room at 9 am 
4. in front of garage doors 
5. above the window of a train 
6. on a door going into a low room 
7. outside a museum or art gallery 
8. outside a room where students are doing an exam