"We don't want to delay motorists any more than possible," Ms. Tress said. "The best advice I can give is for people to choose a designated driver, or leave bars, clubs and parties some other way besides getting behind the wheel."
DUI arrests at checkpoints are made on the spot. Drivers who can arrange for somebody to pick them up can leave after being processed; each will receive a summons by mail to appear before a district judge.
Police have never been known to conduct a checkpoint on an interstate highway in the region. But Ms. Kress said there's no law against it, though safety has always been the overriding concern because of speed and traffic volumes.
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