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Honda did an experiment where they added LCD's to the headlights to give the car expressive eyes to communicate to people outside the car.

Also while it is scary to us and it will take a while there are already self driven vehicles we just take for granted like elevators and driverless trams/trains. Sure they are much easier to make but they weren't trusted at first.

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This comparison is just not a good one.

Trains are on a track, the scenario never really changes. The variables are low. Just like in an elevator, which is largely a mechanical device anyway. There is no real decision making.

and here I was about to make a joke about adding emoticons to the front of self driving cars

No need for anything so corny. Just need some standardized signaling. We already have it for brake lights and turn indicators.

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