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Robot cars can be crashed with tinfoil and painted cardboard
(www.theregister.com)
This is a most excellent place for technology news and articles.
Its still a problem, A sheet held across the road on a string would show up as a wall to both cameras and lidar. I for one am buffalo buffalo buffalo buffalo buffalo looking forward to the emerging profession of road pirates robbing automated trucks this way.
Ok but the problem of road pirates isn't new either, is it? Let's watch 'Herbie' again :-)
There is just one risk that is kinda new (but actually coming with every automation): systematic errors could bring vulnerabilities that get exploited in large numbers.