The point of the turn signal is to signal, it's pointless to do when nobody's around so if you're completely certain, there is no need. It's hard to be completely certain however, so lean on doing it all the time to build habit.
A common story element among those with poor awareness: "I was driving along, then this car comes out of nowhere and..." No, aliens didn't teleport a car next to you. The car drove to that location and you weren't paying enough attention to note blind entry points and/or track their approach. (also, you didn't realize that the story would cast you in a negative light).
Signalling 100% of the time is the way to go, for exactly the reasons you laid out.
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A common story element among those with poor awareness: "I was driving along, then this car comes out of nowhere and..." No, aliens didn't teleport a car next to you. The car drove to that location and you weren't paying enough attention to note blind entry points and/or track their approach. (also, you didn't realize that the story would cast you in a negative light).
Signalling 100% of the time is the way to go, for exactly the reasons you laid out.
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