[haakon666]

If the turn signals are not on the CAN bus it could be annoying to implement.

http://en.wikipedia.org/wiki/CAN_bus

[to3m]

They've made a self-driving car. The merely annoying parts are going to be the fun bits! Everything else is going to be difficult, if not bordering-on-impossible. I find it very difficult to believe that there is any technical barrier to computer-operated indicators.

[tzs]

Wouldn't it be sufficient to wire in a computer controlled switch in parallel to the mechanical switch that the human uses to control the turn signals?

Or just add a new set of turn signals independent of the built-in ones.