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Comment by Sebb767 | Hacker News Reader

> I don't think it's that big of a deal but it's clearly well done from a PR/marketing standpoint.

This is a really big deal. If you are required to instantly take over, you need to permanently pay attention to the current road situation, at which point the autopilot is really just a fancy cruise control. People still stop paying attention, of course, but that's actually a massive risk.

A longer takeover window actually allows you to do something useful, such as read or look at your phone, without taking this risk, since you will have time to adjust to the situation if necessary.

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There is not ever going to be a takeover window long enough to allow the driver to read a book at their leisure. That would require tens of seconds for context switching during which the traffic is going to be changing behaviour.

How will the car detect a construction zone it can’t see yet with enough time to hand over to an inattentive driver?

I look forward to seeing this system in operation. I have significant doubts about the feasibility of its operational claims.

To ensure operation inside the limited legal responsibility, there are just two options:

a) The system would have to be allowed to disengage automatically when conditions change unfavourably, in which case you would still have to be alert, all of the time for when that happens

b) It would not be allowed to do that automatically and you are liable from the moment autopilot drives into an area that is exempt from its legal responsibility as laid out by the insurance coverage limitations

For example, take a look at the exemption of "construction sites": Either the car disengages and says "from here on our it's your job, not ours anymore" or it does not, and then in the case of an accident you are not covered by their limited legal responsibility. What the autopilot can definitely not do, is making the construction site disappear or guaranteeing that the car will never hit one after having been engaged.

You missed:

c) The system needs to detect worsening conditions early either prompt you to take over with enough time to spare (or fail gracefully).

That's the big thing that Mercedes guarantees here: You'll have enough time to take over even if you're doing something else; if the system does fails to give you a warning in time and you crash, Mercedes takes the responsibility. In all other systems, once the autopilot prompts you to take over, you are responsible. With this system, once the autopilot prompts you to take over, Mercedes is still responsible for the next ten seconds, which should be more than enough time to take over in an emergency.

Oh well, we seem to have different opinions about whether a 10s-to-react-window in quickly moving car qualifies as having to be alert all the time. Fair enough.

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