京张高速进京方向时常堵车,给驾车人增添了烦恼。但还有一些人倒是希望堵车,就是周围的农民,他们可以在堵得数公里长的公路旁卖些煮鸡蛋。有一次,我认真观察这些农民,发现了一个奇怪的现象,一个小时下来,同样是卖鸡蛋,有的卖得快,有的人则一个也卖不掉。后来,我终于发现了其中的奥秘。由于车多,过收费站时,大约要排队1个小时,车队长四五千米。凡是鸡蛋卖得快的,都是在远离收费站的地方,最好是你看不到头的地方。常 Beijing Zhang high-speed Beijing traffic jam often, add to the motorists worry. However, some people even hope that the traffic jams will be the peasants who are around and they can sell some boiled eggs next to the roads that have been blocked for several kilometers. Once I observed these peasants carefully and found a curious phenomenon. An hour later, they also sell eggs, others sell fast, and others can not sell it. Later, I finally discovered the mystery. As the car and more toll stations, about to line up for 1 hour, the captain of four or five kilometers. All eggs are sold fast, are far from the toll station, preferably you can not see the head. often