It also seems to assume crossing a bridge at rush hour is cheap. My only guess, and this truly is a guess, it is sees people in the bridge lane stopped and the thru lane moving and takes the average.
I have often wondered how the mapping programs handle multiple lanes moving at different speeds. Sometimes my highway exit backs up for a mile, while there are four lanes next to it moving full speed. All of the maps programs show this as blue (no traffic) even though I am moving at ten miles per hour. I’m guessing that they don’t have the ability to distinguish speed by lane.
Happens to me all the time.
It also seems to assume crossing a bridge at rush hour is cheap. My only guess, and this truly is a guess, it is sees people in the bridge lane stopped and the thru lane moving and takes the average.