想必大家開車時都遇到過這玩藝兒，特別是開土路和小路，猜猜看這玩藝叫什麽？幹啥用的？在中國俺沒見過，隻在北美看到。

       如果有人覺得這道猜猜看很簡單，可千萬別馬上說出來了，您就先憋兩天吧，謝謝！（周一公布答案，南雪北飄可以今天說出來了，先給你戴朵小紅花。）

（答案：TEXAS GATE.  A “Texas Gate” refers to a grid which prevents cattle and horses from entry while allowing the driver of a vehicle to pass through without having to open gates. The term is not to be found in many dictionaries or encyclopedias; it appears to have originated with the northern migration of cattle—the great cattle drives from Texas in the late 1870s—and is in common usage in the northern American western states and the Canadian west. In Texas, these gates are called “cattle guards.” In the SARM 1997 Resolution No. 15, both terms are used and “Texas” is spelled with a lower case “t”: “Whereas, many individuals and oil companies install cattle guards, commonly known as texas gates, on road allowances without approval from council.” ）

       圖1：全貌。
      

       圖2：局部。這個是方鋼，上圖是圓形鋼管，大同小異。