Maybe learn to read?

You can be at a safe following distance for traffic, and have debris in the road that isn't stationary that takes a second or two to judge where it is going while braking and still needing to swerve because it is approaching faster than a hard braking car. Like stuff that falls off a construction vehicle and the car in front of you swerved around. There was plenty of time to brake if they stopped short, but this isn't the same thing.

Guess I could signal the moment I swerved but not sure how that is going to be helpful to anyone behind me to tell them what I am already doing.

Also, three car lengths isn't nearly far enough in slow traffic, and deadly on highways.