

You’re right about turn signals.
A lot of people have “target fixation” and telegraph their moves somewhat. I look at where the car is tracking in the lane and what their head is doing (if I can see it). Most people drift left or right on the highway before they change lanes, exit, or turn. It’s no excuse for bad manners, but it helps.
And you shouldn’t. Everyone is equipped with a lethal weapon masquerading as personal transportation, where safety is predicated on mutually-assured-destruction and the presumption that everyone is a sane actor. Keep your head on a swivel and stay safe out there!