A couple of decades ago it was feared that the Dutch economy would slowly smother in the traffic jams. The invention of the cell phone however appeared to have countered that. People just continue doing business by cell phone, while waiting in the traffic jams. I just discovered that cell phones have a second function in the traffic as well nowadays; to measure traffic delay and traffic jams. The speed at which the cellphones move from one emitter station to another is registered and analysed. The result is used to calculate the traffic jams on the roads in the Netherlands to get a near real time overview of the traffic misery here. Any other place in the world where a similar system is used?