That is easier said than done in some circumstances. I was driving I-80 in Wyoming doing about 65 in the left lane. The speed limit was 75. As I topped a gentle rise there was a car behind a car with a boat trailer stopped in the left lane. From the moment I saw it there was barely enough time to swerve into the right lane and avoid plowing into it. Had there been traffic in the right lane next to me I would have hit that mess before I could have touched the brakes.
It's easier with a manual transmission. I've gotten into the habit of gently lifting my foot off the accelerator as I reach the top of hills. The car slows and I'm already halfway to hitting the brake if I have to.
People behind me get irritated, but I really don't care anymore. Besides, the cops always sit on the other side of a hill or curve. The first time my mother-in-law road with me I looked like I was psychic when after speeding for some time I slowed for a hill and other the other side sat a cop.