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The devices use GPS to create a “geofence” — an electronic perimeter around an object. If the object deviates from the defined perimeter — at a truck stop or anywhere along a truck’s entire route on an interstate highway — an alert is sent to headquarters so the driver can be contacted or law enforcement called. However, some experts warn that any security these devices offer is “collateral” to their primary logistics function and that the best security is to set up more obstacles for potential thieves and follow “tried-and-true” asset tracking practices.For the full story, see the March 26 print edition of Transport Topics.