[MR4D]

From the article:

"Using billions of anonymous measurements from cell phones and vehicle sensors, Here Technologies, a location platform company, calculates how traffic conditions change throughout the day"

Emphasis on the word "billions". I find my own can be quite variable too. Large sample sizes should make that number more predictable.

[Dylan16807]

More predictable does not imply more consistent. It just means you can nail down numbers like 10th and 90th percentile more easily. They'll still be far apart in many areas.

[MR4D]

I'm not sure how you could understand statistics and make that statement. It's contradictory on the face of it.