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瑞士有一些路标是用热敏薄膜制成的,当气温降到摄氏零度以下时,路标会自动发出危险信号,以警告司机防止汽车在冰冻路面上打滑。日本东京街道上出现了一批太阳能路标,路标的内容根据昼夜的变化会自动变化。例如白天,路标显示出“禁止停车”,晚上,路标则显示出“打开车灯”。美国的高速公路旁竖着许多路标,语言诙谐幽默,“你的妻子付得起丧葬费吗?”
Some signposts in Switzerland are made of heat-sensitive film. When the temperature drops below zero, the signpost automatically signals a danger signal to warn the driver to prevent the car from slipping on the frozen road. A series of solar signposts have appeared on the streets of Tokyo, Japan. The contents of the signposts change automatically according to the day and night changes. For example, during the day, the signpost shows “no parking” and at night, the signpost shows “turn on the lights”. There are many signposts up the U.S. highways, humorous in language, “can your wife afford funeral expenses?”