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As an American journalist here, I have been through many checkpoints and have come close to being shot at several times myself. I look vaguely Middle Eastern, which perhaps makes my checkpoint experience a little closer to that of the typical Iraqi. Here's what it's like.
You're driving along and you see a couple of soldiers standing by the side of the road - but that's a pretty ubiquitous sight in Baghdad, so you don't think anything of it. Next thing you know, soldiers are screaming at you, pointing their rifles and swiveling tank guns in your direction, and you didn't even know it was a checkpoint.
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'Stop or you will be shot'
Another problem is that the US troops tend to have two-stage checkpoints. First there's a knot of Iraqi security forces standing by a sign that says, in Arabic and English, "Stop or you will be shot." Most of the time, the Iraqis will casually wave you through.
Your driver, who slowed down for the checkpoint, will accelerate to resume his normal speed. What he doesn't realize is that there's another, American checkpoint several hundred yards past the Iraqi checkpoint, and he's speeding toward it. Sometimes, he may even think that being waved through the first checkpoint means he's exempt from the second one (especially if he's not familiar with American checkpoint routines)......
http://www.csmonitor.com/2005/0307/p01s04-woiq.html?s=t5