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The article reports on personalized software and a network of road sensors that will tailor routes to avoid the worst snarl-ups. New technologies are at last taking on the dreaded traffic jam. The streets and highways of most developed countries are already littered with sensors recording traffic speed and density. Existing in-car navigation systems, such as Trafficmaster in Great Britain, display some of this information to drivers, while others send text alerts to warn of congestion hotspots. Drivers who subscribe to a service called BeatTheTraffic, first tell the system via a Web site about trips they regularly make.