At my hotel in São Paulo, all of the lights in the hallways are on motion sensors with very short timers. If you stop moving, the lights go out. It's a little disconcerting at first, but it makes a lot of sense. Why light a hallway when nobody is in there?
More surprising, the electrical power is "off" in your room unless you insert your key card into the device I've pictured. When you aren't in the room, everything is dead. Lights, air conditioning, everything (update: except the refrigerator). Once again, why waste power when nobody is there?
These little things add up... Maybe we in the US ought try a little bit harder to catch up with the energy policies of our Portugese speaking neighbors to the South.
Now Brazilian traffic... well... let's just say that Brazilian traffic is another story :-)
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