Self-driving cars are hard because of all the human drivers on the road. It’s very easy to program a car to follow all the rules. But humans don’t always follow every rule. People speed, change lanes without signaling, run through red lights and stop signs, etc.
If every car on the road was self-driven with no pedestrians, it would be a perfect system. But as soon as you introduce human drivers and pedestrians into the equation, things become exponentially more complicated.
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