how is it updated? if someone has a gps device in their car, does the satellite read how fast they are going and that updates the traffic info?
how is it updated? if someone has a gps device in their car, does the satellite read how fast they are going and that updates the traffic info?
red means stopped
yelow means slow
Green means go, clear
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.
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.
how is it updated? if someone has a gps device in their car, does the satellite read how fast they are going and that updates the traffic info?
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.how is it updated? if someone has a gps device in their car, does the satellite read how fast they are going and that updates the traffic info?
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...
how do you get traffic functions on google maps using the iphone..i didn't know you could do this!
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.
correct but the iphone dose not have gps, it has gprs. its completely different and dose not require satellites.
correct but the iphone dose not have gps, it has gprs. its completely different and dose not require satellites.