While the margin of error is much lower on a freeway due to the speeds, other drivers are generally a lot more predictable (also in part due to the speeds).

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aeturnum 3 days ago | parent | next [-]

There was a good overview on here a while ago about the challenges[1]. You need to plan longer in the future and your sensors need to reach further. It's also a much bigger challenge to collect sensor data as fewer diversions happen per mile (but those that do have higher stakes).

[1] https://news.ycombinator.com/item?id=38973404

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davidw 3 days ago | parent | prev | next [-]

Sure - a good freeway is actually a lot more predictable in most circumstances than city driving, so as a problem to solve it's likely a little bit less complicated. What I wonder about is what it feels like as a passenger. I wonder if it would be more or less frightening than being a passenger when my 17 year old is driving.

	▲	jdeibele 3 days ago \| parent \| next [-]
		I use adaptive cruise control a lot, where I rely on the car for keeping a safe distance. I have a limited version of SuperCruise which means it operates hands-free on freeways but nowhere else. My wife's Equinox EV has the regular version, which operates on a lot of arterials near us and has more capabilities. The first time that the Equinox signaled, changed lanes to pass, signaled, then changed lanes back was shocking. We moved to a small town and drive a lot more than we used to and I find that having those capabilities really helps relieve the stress. I will say that I move to the center lane when going through a notorious set of curves on I-5 in Portland because my Bolt doesn't steer as smoothly as I'd like near the concrete barricades. I wanted SuperCruise because it has a fantastic safety record. There are lots of times it's not available but when it is, I have near-total confidence in it.
	▲	rdoherty 3 days ago \| parent \| prev [-]
		I took a Waymo that drove on an 'expressway' which had a speed limit of 40mph and it was definitely a different feeling. I did feel a bit scared, at 25mph it feels like a gentle theme park ride, at 40mph it's beyond that and feels dangerous.

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themafia 3 days ago | parent | prev [-]

Roads that get used more collect more debris. They also break and require maintenance more often. That maintenance is exceptionally disruptive to the normal operation of the road.

Other drivers aren't your only challenge out there.