I suspect that what's more likely to happen is that the board will wedge in a hole, stop moving, and you'll simply find yourself stepping forwards off it.

The standing posture means that you're braced for a step anyway, and the speed is totally compatible with your mark I human undercarriage system. It's not like you're on a skateboard going at 30kph. Plus you're not fastened into it.

I actually think it's a really interesting and subtle piece of design. I want one. (Plus I have to admire anything that looks quite that stupid.)