[natevancouver]

In my town Google Maps has traffic “data” for every side street and it’s usually wrong or irrelevant. A red light at an intersection will show up as a traffic jam and then I’ll get weird routes trying to go around it.

Traffic for freeways, on the other hand, is amazing.

This likely has to do with the quality of traffic data provided by the municipality. But Apple Maps doesn’t have the same problem. Their side-street traffic data is reliable around here – very surprising.

[IanCal]

I'm pretty sure maps uses data from a few sources, one being how fast android devices are moving near there.