I think he means do you have to refresh the iPhone to get updated traffic speeds or does it do it automatically every so often. A good question as I've been wondering this myself. Traffic sucks in so cal, especially the 605/5/405. Oh well...there are sensors under all the socal freeways that give data. you can see the cracks on the road when you drive over them. thats how it works here. other areas might be different.
Just a note: GPS is one-way, from satellite to receivers. Nothing transmits back to the satellite.
Those diamond patterns cut into the road you see every so often. It measures the speed and transmits it to a local agency. Google aggregates the data from major cities. I don't know how often Google maps gets updated but it seems accurate.
Wouldn't it really depend on each of the sites definition of Red, Yellow and Green? On SigAlert, it's:I've been wondering that myself. How often is it updated anyway?
Take today for example. I looked at the Traffic data on Google Maps and it showed that much of the freeway I would be taking was Red. But then I checked SigAlert and that said most of it was Green with some rough spots.
I then drove it and found that my experience matched SigAlert's. So much for traffic info from the Google Maps...
I can't believe they don't include the manual in the devicehow do you get traffic functions on google maps using the iphone..i didn't know you could do this!
correct but the iphone dose not have gps, it has gprs. its completely different and dose not require satellites.Just a note: GPS is one-way, from satellite to receivers. Nothing transmits back to the satellite.
Major cities have speed sensors that collect traffic data. The database view to the public is updated usually about once a minute.
No idea how often or if it's updated on iPhone.
Wow, way to resurrect an old post with incorrect information.correct but the iphone dose not have gps, it has gprs. its completely different and dose not require satellites.
hahaha great joke. lolwut? you were being serious??correct but the iphone dose not have gps, it has gprs. its completely different and dose not require satellites.