Las Vegas is hot, and getting hotter. Today, Friday 22 June will probably be at least 111 on The Strip. The ground also gets incredibly hot. Black surfaces such as a tar parking lot, and this gutter, can and do reach 160 (one hundred sixty degrees F).
Another thing the heat does is cause thermal distortion in photographs. Those of you who are photographically inclined, may observe the thermal distortion in this photo of a cab on Las Vegas Boulevard, near Mandalay Bay.
As well, it is very bright out. Drivers in Las Vegas turn their headlights on in daylight in order to be better seen, in the event that they are backlit by the sun.
People seem to get lazy eyed in the sunlight, and tired, so be careful. The Strip is an incredible distraction anyway. Crowds, heat, traffic, bright bright sun; so wear sunglasses and drive deliberately safely. At night too.