[jccooper]

Trains (which are mostly self driving) have a button the operator must push once in a while to prove he's awake.)

[mblakele]

If it's working: http://www.ntsb.gov/news/press-releases/Pages/PR20150206.asp... describes a head-on collision between two trains. Apparently a handy new automation feature on one train fooled the vigilance device.

Then there are all the jokes about using a http://en.wikipedia.org/wiki/Drinking_bird in situations like that. And then there's https://www.youtube.com/watch?v=Kv9JYqhFV-M to hack the Mercedes ALA.