You might as well argue the semi-anually vs bi-annually case. the semi and bi prefixes have lost meaning because of continued colloquial use.
Even one textbook I teach from defines semi-monthly as twice a month and semi-weekly as once every two weeks. The terms have less of a literal meaning and more of a context-specific meaning.
99.28% of visitors arrive directly at the site, and only 7.7% arrived from Google
But what about the other -6.98% ?
They're from the future! The data will zero out again once we find those people who traveled back in time to Facebook...
. Driverless technology becomes workable when it is better than the average human driver.
The bar has always been set higher than individual responsibility because of liability lawsuits. Traditionally, if someone besides the 'victim' can be even remotely blamed, they will be held jointly responsible. This means that a vehicle that is faulty less often than a human driver will still be subject to numerous lawsuits unless they can prove the catastrophic failure was due completely to the abuse of the system by the driver. The system must either be near-perfect, or have enough failsafes built in that the car cannot be blamed for failures.