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by Retric 5 hours ago
At minimum it needs to pay attention to railroad crossing bars and bridges.

They show a 2D representation to the driver because that’s good enough for drivers, but I wouldn’t assume that represents how the system operates internally at every stage. Even navigating requires the concept of bridges crossing roads without intersecting them.
1 comments
Reason077 3 hours ago
It is indeed known to have issues at railway crossings:

https://news.ycombinator.com/item?id=47783427

AFAIK, there's no issue with bridges that cross roads, however. It will just ignore a road that's above or below the one you're travelling on that doesn't intersect with yours. Just like a human driver would do.

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Retric 3 hours ago
> It is indeed known to have issues at railway crossings:

At scale you can “have issues” and still work 99% of the time. If it’s completely incapable of handling railroad crossings that’s relatively easy to verify.

> AFAIK, there's no issue with bridges that cross roads, however. It will just ignore a road that's above or below the one you're travelling on that doesn't intersect with yours. Just like a human driver would do.

As a user of the system that’s worked it all out it’s not an issue for you, but getting that behavior from raw sensor data is non trivial.

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