4 deaths per 50 million miles means it’s just under 1 death per 10 million miles. That would put riding a one wheel for 1 mile at the same risk as biking 1 mile, walking 2 miles, or driving 25 miles[1]. That is of course only looking at death and not serious injury.
Still, as other people have mentioned there are solutions Future Motion has been avoiding that would significantly lower the risk. Adding small wheels on each side in case of nosedives, or adding a loud audible warning in case of low battery or max speed being reached rather than just a subtle physical alert are two that have been suggested here and seem like they would make a big difference.
Still, as other people have mentioned there are solutions Future Motion has been avoiding that would significantly lower the risk. Adding small wheels on each side in case of nosedives, or adding a loud audible warning in case of low battery or max speed being reached rather than just a subtle physical alert are two that have been suggested here and seem like they would make a big difference.
[1] https://en.wikipedia.org/wiki/Micromort