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Senate Majority Leader Harry Reid and fellow Democratic Senators Chuck Schumer, Frank Lautenberg and Tom Udall urged the hi-tech giants to stop selling the software unless it is stripped of the drunk-driving feature.

"We appreciate the technology that has allowed millions of Americans to have information at their fingertips, but giving drunk drivers a free tool to evade checkpoints, putting innocent families and children at risk, is a matter of public concern," they wrote in a letter released by Mr Reid's office.

The applications rely on driver-generated databases of speed traps, speed cameras, or even drunk driving checkpoints and include audible alerts.

PhantomAlert, which the USA Today newspaper called "one of the most popular," asks potential customers on its website: "Tired of traffic tickets? The embarrassment, the time, the points, the frustration, the money?"

"You will be alerted as you approach: Railroad Crossings, Dangerous Intersections, Dangerous Curves, Speed Bumps, Speed Traps, Speed Cameras, Red Light Cameras, School Zones, DUI Checkpoints."

DUI means "driving under the influence," or intoxicated.

The letter went to Google chief executive Eric Schmidt; Scott Forstall, senior vice president for iPhone Software; and Research in Motion co-chief executive officers James Balsillie and Michael Lazaridis.