Autonomous cars find the way to their destination using a number of critical technologies, including some version of a global position system and a central brain to interpret that and other data. But many of those technologies are not reliable or accurate enough today, and may not be for years to come.
There are numerous reports of vehicles missing their stop, or trucks being guided into alleys that are too narrow or underpasses that are too low. The data used to make those decisions is sometimes incomplete or confusing, and coverage for communications technology is often spotty. But a vehicle may need to make sudden adjustments based on that data, and fully autonomous vehicles need to be able to react in predictable ways even when they don’t have a pre-programmed solution.
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