I think I just solved a Q mystery - so I'll go ahead and posit this here and please make this a notable since it's an incredible coincidence if nothing else.
So this post is about "Car control" using phones which has an adjoining post that day on the same subject about phone tech shenanigans.
Now note the date and names involved. The guy filming the video is named "Hefner"
08/31/2017 Rogue vehicle gets too close to Trump’s motorcade
"An online video surfaced purportedly showing a vehicle attempting to “ram” Trump’s motorcade in Missouri, but officials said the incident was simply a case of malfunctioning brakes." https://nypost.com/2017/08/31/rogue-vehicle-gets-too-close-to-donald-trumps-motorcade/
Video itself https://youtu.be/1Yqa5PUViPo of Hefner and other men with phones nearby
Comments from those behind the wheel saying they had no control at all. https://www.ky3.com/content/news/Driver-of-car-crashing-near-presidential-motorcade-is-talking-It-was-terrifying–442415653.html
Now what's interesting is less than a month later Hugh Hefner dies.
09/29/2017 Hugh Hefner, Playboy Founder, Dies at 91
https://variety.com/2017/film/news/hugh-hefner-dead-dies-playboy-founder-1202575088/
So, did he have some family running an errand that day? Note Drudge placement as I find they often hide comms about it.