https://patents.google.com/patent/US8830048B2/en
Think Paul Walker and Michael Hastings. Those were NOT accidents! I think Tiger was being given a warning.
US8830048B2 - Control of a personal transporter based on user position - Google Patents
An apparatus controller for prompting a rider to be positioned on a vehicle in such a manner as to reduce lateral instability due to lateral acceleration of the vehicle. The apparatus has an input for receiving specification from the rider of a desired direction of travel, and indicating means..
https://patents.google.com/patent/US8830048B2/en