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Sam was a farmer. He was born on his farm and had lived on it all his life. He had married his neighbour’s daughter, and they grew fruit and vegetables.
Sam got up at five o’clock every morning to gather them and take a load off to the market in his truck.
    There were very few vehicles on the country roads at that time of the morning and Sam knew how to get to the market very well. So as he was going along, he was always thinking about everything except his driving.
     One morning he was thinking about what crops to plant for the next year’s harvest, and whether to try something else. After a few kilometres, Sam came to an intersection with a stop sign. He always crossed the road without stopping because there was never any traffic on it at that time of the morning.
     But this morning a young policeman whom he had never seen before signalled to him to stop a hundred meters beyond the crossroads.
    The policeman said to him, “Didn’t you know that there was a sign telling you to stop at the crossroads before going over the main road?”
    “Oh, yes,” answered Sam, “I knew that there was a sign at that point, because I go to market along this road every morning.
    But what I didn’t know was that you were here.”