I kept working on my previously posted mod, this is an update on how its going.
You can find out more about it on the KSP Forum
I don't think this scene is showing working turn signals as everyone seems to think.
What no one is mentioning is that the GPS line is pink.
In the kayaking scene at 17:29 Jason is seen to have a teal icon on the minimap, while Lucia is shown in pink at 20:09.
I think what we're seeing is the player controlling Lucia in the passenger seat. NPC Jason could easily be explained to signal as NPCs always could use them.
Additionally, Lucia is seen driving with pink GPS line and later we see her driving again without using turn signals when you'd expect them.