Not until someone is killed will there be pressure to go back to the drawing board.
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Like dangerous interceptions, one fatality is just an anomaly and noting is done. Not until there is a repeated pattern of many fatalities will a traffic light be installed’
Self-driving cars are no different. It will take many fatalities; perhaps each state will make a different decision on just what constitutes ‘many’ before they do anything at all.
A death will mean nothing. A $100+ million settlement will.