Toilet ergonomics is always intriguing as attested by this picture taken from the french TGV. Using the tap water and the hand dryer require to pass your hands close to a sensors, as indicated by the 2 stickers. However: - the depiction in red of radiowave detection is perhaps clear enough for someone used to live with sensor-based device all over the place but not for everybody. - the exact location of the sensor is wrongly depicted as it is not necessarily on the left of the tap/dryer.

Why do I blog this? As we already discussed here, the representation of sensor-based interactions is always more complex than expected by the engineers who designed them. Next time, you're in such train try to spot if the tap has been used (see traces of water).