Vegas is in the middle of the desert (lots of sand)...even very fine particles that get kicked in the air by wind can make the roads more slippery. In the inland areas/desert of Southern California, same situation.
Originally Posted by dogbone
I drive my M3 to Vegas every year, and I have plenty of track experience, so I can say that I know how to control my car. Down near the Vegas strip on the surface streets, I have also found that many of the road surfaces in Vegas have strangely low traction. It's like there's a bizarre coating of tar or something that gives less traction. Many of the road surfaces even look shinier than "regular" black top. I used to think I was crazy for thinking this, but I've felt lower grip on corners in Vegas many times. And no, I wasn't flying around the corners. I save that for the track.