Yeah grip surfaces can vary widely, and you found a really slick one. Street surfaces can vary a lot too, so it's good to watch out for changes and feel them out carefully if you're driving aggressively. My most recent example was a roadtrip from Houston to San Antonio for the weekend. Compared to Houston (and the highways between), the street surfaces in SA (at least around the riverwalk/mall/zoo/etc area where I was) were very, very slick. I had to be a lot more careful on the throttle when zipping around SA. Something about the type of asphalt they use, it's like it has tons of tar, which has boiled up onto the surface and then hardened into a solid slick black layer from the sun and traffic over time.
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