Update:
I looked up where Google gets its traffic information from...
o How Google Maps Gets Its Remarkably Accurate Real-Time Traffic Data
<
https://gadgets.ndtv.com/apps/features/how-google-maps-gets-its-remarkably-accurate-real-time-traffic-data-1665385>
"Google collects its mapping data from a wide variety of sources
including road sensors, user contributions via Map Maker,
and local transport departments, among several others."
"But the accuracy of location data is unmatched only because of its
users, since the billion Google Maps users on the road act as sensors
for the app, which make the service as precise as possible."
"Another source of traffic data are users of Waze app, which Google
acquired in 2013 for $1 billion; Waze users feed information like
accidents and traffic jams on their routes into the app, which Google
can use to make your navigation experience more accurate."
Waze says:
o <
https://wazeopedia.waze.com/wiki/USA/Traffic_data>
"Nodes are the primary way Waze routing server looks at routes.
All data about transition between two segments is stored with the
ID of the node involved, as well as the two segments connected to it."
1. "As you drive, the Waze app (client) on your mobile device collects
data about your GPS location and when you were there.
It sends that data to the Waze server."
2. "The Waze server uses this data to figure out which nodes you travelled
through, which segments you used to travel between them, your average
speed, and how long it took you to make it through the segment."
3. "This data is collected even on drivable segment types for which the
Waze routing server does not use that data. Traffic data collected
on short segments (less than 19.69 ft (6 m)) is l
It keeps track of this information in the forward (A to B) and reverse
(B to A) direction, and for every possible exit from the segment at the
node it is joined to. So if segment 100 is junctioned to segments 201,
202, and 203 at its B junction node, It can figure 3 different cross
times in the A->B direction - for 100->201, 100->202, and 100->203.
If the segment has a restricted lane (Bus, Express, HOV, etc) , the same
type of information is stored for one "extra" lane. So if segment 100
also has a left HOV lane, then Waze will be able to figure out 3 more
cross times in the same direction - for 100HOV -> 201, 100HOV->202,
100HOV->203."
This 2019 article in Science ABC gives a short history of how Google's
methods of collecting traffic data over the years has changed over time:
o How Does Google Maps Know About Traffic Conditions?
<
https://www.scienceabc.com/innovation/how-does-google-maps-know-about-traffic-conditions.html>
"In 2009, Google shifted to crowdsourcing"
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Posted, as always, to bring reliable respected cites of fact to this ng.