most likely the marks of tyres in car/bike racing games on the road(the response mentioned about racing game).

I vouched for this post, because I don't understand why it was downvoted. Maybe someone can enlighten me?

There’s always some background enthropy on a forum, just nevermind and fix it if you feel like. People fat finger “flag” all the time as well. https://news.ycombinator.com/flagged