It depends upon the place you reside and what sort of unit you’re . Most GPS gadgets that present visitors get their information from a handful of suppliers like Clear Channel and Navteq, which gather their data from quite a few sources. Information of a coming pileup reaches your dashboard as textual content information over FM airwaves and updates each 5 to fifteen minutes. This technique works nice for main freeways in massive cities, however neither the community nor the info companies cowl rural areas and facet roads, and the FM sign can’t ship a lot past fundamental data.
Two new techniques, Garmin’s nüLink and LiveTraffic from TomTom, as an alternative use the mobile community to beam alerts to the nav models. Meaning you possibly can obtain updates extra steadily and in a wider space, and you’ll find out particulars equivalent to whether or not the slowdown is because of development or an accident. However the service will value you a couple of dollars a month.
If GPS makers and cellphone carriers can attain an settlement, we may finally have a system just like the one being rolled out in Europe that will get data from each idle cellphone on the street, offering really ubiquitous visitors protection.