Who knows! That's the whole point. You may even be wrong about why traffic was stopped in the first place. At the end of the day, it doesn't matter.

Cars inherently create traffic. If you don't want to have to worry about traffic -- ever -- ride a bike. If you insist on driving a car, don't complain about congestion! It's like going sailing and complaining that you're getting splashed!

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And, before the "oh, but I need a car because of XYZ reason" -- great, I think you should drive then! But, the overwhelming majority of people driving cars on city roads are doing so out of "convenience" (which, to me, is more just laziness becasue it's not convenient being traffic and causing congestion all day!). So, let's do everything we can to get people who use cars-of-convenince off the roads on on public transit, on bikes, or on foot -- it's better for everyone.