In Europe, Speed Cameras Meet Their Technological Match

BERLIN — When Marc Guerin, a software salesman, drives the 38 kilometers from his home west of Paris to Roissy Charles de Gaulle Airport, he seeks out the fastest route for his Audi Q5 crossover and powers up his Coyote, a radar warning and traffic service that alerts him to the locations of France’s 3,000 speed cameras. When Mr. Guerin comes within four kilometers, or two and a half miles, of a speed camera, his Coyote screen warns that he has entered a “risk” zone, and he closely monitors his speed.