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Comment by johannes1234321 | Hacker News Reader

However that has to be secure that a hacker can't simply stop all traffic or cause speeding

Which is pretty much impossible if you let people have the physical cars. They will report their speed to other cars, they will measure their speed from pulses generated by something rotating on the vehicle, replace rotating thing with your function generator and then you can tell other cars you are going any speed you want. Turn up your reported speed and watch all the other cars get out of your way!

Well, you can take the input as a data point, but make the final decision based on sensor data. Thus the shared data can make the flow smoother.

But I'm also waiting for fake street signs to troll/manipulate self driving vehicles :)

It's easy to put up fake street signs to troll/manipulate human drivers, yet that hardly ever happens. I have read stories of people putting up fake speed cameras in their front yard to slow down traffic, but no one dares to fake speed limit signs.

Except Finland during elections. Where advertisement with nice white round circles with numbers inside are a standard. Single vote for candidate system where number of candidates can run to over hundred.

No human would think that number next to person is speed limit, but machines aren't trained for that...

Here in Gemrany I there are signs with "voluntarily 30" or similar combined with some surrounding images etc. and yes one can fake it, but most fakes can be identified realtively easily by humans (positioning, color, material (non-reflecting cardboard), ...) some high quality fake sign might however exist for a while.

Also there is the reverse: people stealing signs (https://news.ycombinator.com/item?id=25223633) or putting stickers on them (or snow, mud, ...) where most humans know what to expect (stop sign, yield, ... have specific shape for a purpose; empty frame where city starts; ...)

Going out of a somewhat controlled small area in SV/SFO or AZ is a huge task. Going to a different country requires complete re-learning of the models ... and then there are humans ...

I tried “tesla swatting” with a fake speed sign a couple of years ago. It worked then (autopilot went from 45 to 15 MPH) and I assume it still does.

Can I copyright the phrase “Tesla swatting”? :)

Sensor data is the input and can be faked!

I've always thought we should just start with a dedicated lane on the highway for self driving vehicles, raise the speed limit on it, and let the vehicles communicate with each other.

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