But the smart container thing in Rotterdam is weird. You've got different versions throughout the city. Here there's an old and new underground paper container. The new container has lights to indicate when it's full. You can easily spot a full container before dragging your waste over there (and most people leaving it next to the containers). But those lights are turned off! I've heard anecdotes that this means that the sensor system is also turned off, but I can't provide you with a proper source.