Two shots from the road. This first one is following a semi down from the highest point on I-5, he was trailing an ever increasing haze of blue smoke from his rearmost wheels as the brakes fought a losing battle against gravity and inertia. This shot was taken near the bottom, so I think he made it OK.

Coming in the the Vegas strip from the north, we're driving along the one of the approach paths to the airport. A shadow crossing over us alerted us that a plane was landing, but as the pilot lines up his vectors, it starts blowing black smoke, leaving a trail. I've never seen this before, but the plane made it to the ground ok.