[jokamoto]

That's already been demonstrated to be a side effect of a still-spinning rear wheel:

https://www.youtube.com/watch?v=Ak7xP8eghog

It should also be noted that "incident" occurred on a fast downhill section while Hesjedal wasn't pedaling so even if there were a motor it is exceedingly unlikely it would still be engaged at the time of the crash.

With a plausible physical explanation and no way to go back in time to check the bike for a motor, there's not much for the UCI to go after even if it felt the need to.

[BoppreH]

I'm not convinced. Compare:

https://youtu.be/ynLMfzLTc8M?t=8

and

https://youtu.be/Ak7xP8eghog?t=13

That was the best run in that video. The wheel spun less than 180 degrees after being carefully placed on the ground. In the original video the wheel was in contact with the ground for seconds before it got free to spin. It then spun for more than 180 degrees and seemed to be accelerating.

I know such motors are supposed to stop when you stop pedaling, but it could be a different one. There's still enough evidence to look damning.

[dpark]

It was also on a pretty steep downhill slope, which by itself could have been enough to cause this. You put a wheel on a slope and it's going to try to move downhill. It'd be suspicious if the bike had moved uphill, but the video clearly shows it moving downhill.

[gerpsh]

I'm willing to believe the explanation for this particular case, but I find the Cancellara video to be much more damning, and a pretty strong hint that mechanical doping has found its way into the highest levels of the sport:

https://www.youtube.com/watch?v=8Nd13ARuvVE

The way he just smokes everyone around him without changing his cadence, standing out of the saddle, or even changing the expression on his face seems at least a little suspicious.

[VeejayRampay]

Except it's not plausible. Come on.