Comment by slothsleauth

Google maps marks data out of typical traffic for that day and time in the week, basically meaning that if on a Thursday, at 3 pm, there is a wait time reported of 2 hours, where there is typically a reported wait time of 30 minutes during that same weekday and time, then it is marked as above usual traffic (and there are other factors google marks data with - a larger range than just saying "above usual traffic").