I’m confused. Have you seriously never encountered a human driver who goes slower than you’d like or doesn’t merge into a space? Sometimes they don’t even know the blinkers are on, or indicate left then swerve suddenly hard right.

For me, especially as a motorbike rider, the Turquoise indicator would give me confidence that the car isn’t going to do something monumentally stupid and get me killed.

Just yesterday I pulled into an exit lane and the car that (was) in front of me suddenly swerved hard into into my lane to cut me off and stop me from illegally overtaking them. Luckily I hadn’t overtaken then, even though they were driving well under the speed limit (even the exit lane had a higher speed limit than what they were doing). At the end of the exit lane they swerved back into their lane and nearly hit someone who had accelerated back up to the speed limit once the idiot slow driver had moved out of their way. Human drivers are far less predictable than robot ones.