A long car tunnel was built in the mountains on the lake in Geneva, Switzerland. Before investing in use, the general engineer remembered that she forgot that the car driver opened the light before entering the tunnel. Because despite the lighting facilities of the tunnel, it still needs to prevent disasters in the event of power outages (this accident is likely to occur in the mountains). So the engineer made a sign, which is written above: Warning: Please open the headlights in front of the tunnel. They hang the sign at the entrance to the tunnel, and the tunnel was hung as scheduled. Since the problem has been solved, everyone feels very easy. 400 meters from the tunnel East Exit 400 meters is the best holiday resort in the world, overlooking here, and the entire Geneva Lake will be closed. Every day, there are hundreds of thousands of tourists appreciate the beauty, relax their tired body, may also enjoy a delicious small "picnic". At the same time, when these hundreds of gods refreshing tourists return their cars, they will have ten or more people accidentally find that the car batteries are dead - because they forgot to turn off the headlights! As a result, the police were forced to use all of their resources, so that the car started, or dragging them away. The tourists complained, and the gambling swear to persuade all their friends without traveling to Switzerland. New problems have emerged, obviously, should be solved by engineers. The engineer considers a lot of solutions: 1. She can stand a sign at the tunnel, write: Turn off the light, but people in the night will turn off the headlights. 2. She can build a charging station in the scenery overlooking. But it takes a lot of money to maintain the charging station, and if the charging station will be more annoyed. 3. She can authorize a private company to operate the charging station. But this will make the scenic area commercialization, which is absolutely unacceptable to the government and visitors. 4. She can establish a more clear sign at the end of the tunnel.
(If you are her, how will you solve it?)
With her intuition, the engineer believes that it will be able to come to a more clear call through some way. She tried many alternatives and finally got a simple masterpiece reflected in Swiss: If this is daytime, and if your headlight is driving, then extinguish the car; if it is late, and if your headlight is not Open, then open the car; if this is daytime, and if your headlight is not open, then don't open; if you are late, and if your headlights are open, then don't turn it. However, wait for people to read this sign, say that their cars have already flew over the fence, and sank to the bottom of the lake - this is not an acceptable solution. There is definitely a better way! In fact, the chief engineer did not complicate the problem. The final solution is that at the end of the tunnel, hungly hang a signage: Are you lights?
If people's lights are really bright, a small reminder may be more effective than those complex solutions. --- Excerpt from "Your light is on" Donald. Gauss Galald. Winberg
