Re: Shouldn't they have a 'safe' failure mode?
Pretty much every other form of transportation uses that model, if the brakes fail, automatically slowly apply the brakes. Trains will slow down to a gentle stop when it senses that the operator isn't in control or doesn't receive the "Safe To Go Fast" signal. Planes and even spacecraft will disconnect the automatic systems and sound an alarm to inform the meat-sack that its now their problem. Drones will land if they either lose signal or get confused. Hell, even cheap dollar-bin R/C cars will stop if they don't receive instructions...