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I wouldn't. What do you think's going to happen when they encounter road works, pedestrians etc.

Or the car's in a carpark, or a tunnel, or between tall buildings where there's no GPS coverage.

Autonomous vehicles will have plenty of sensors, radar, ultrasonic, thermal and cameras. .
I agree there will be a ton of sensors to include radar and such, but I still think the primary "the road is here" decisions will be made with GPS as opposed to optics. I guess time will tell.
 

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GPS needs to improve substantially to enable it to guide a car accurately down a road. Currently you may be accurate to 20 feet, but I have areas where I take and it can't tell if I am on a road, or running parallel to the road on the service road or collectors.

GPS.gov: GPS Accuracy
From your link: "Higher accuracy is attainable by using GPS in combination with augmentation systems. These enable real-time positioning to within a few centimeters, and post-mission measurements at the millimeter level. LEARN MORE"

Think that'll do?
 
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