In the Internet appeared the video, shot one motorist. Unfortunately, any information about the shooting location and the operator is not available, therefore, will be confined to the movie, which strikes to the core.
So, in the video you can see a little cloud floating on the track. After a while an anomalous object rose up a few meters.
Netizens don’t believe in what he saw on video. According to them, a motorist filmed a large piece of cotton, soap suds or something like that, but certainly not a cloud. Clouds, as you know, can’t behave for objective reasons.