Oneder

You don't really. You don't massively slow at every single driveway to 2-3 mph because there is someone behind you and he might decide to turn right and smash through you while doing it. Which has happened to me two times with hit and run drivers. If you could hear someone coming behind you and slowing down then you would have a good idea what's happening and take measures otherwise they would just plow into you from the side before you even knew they were coming. I still got hit twice while some idiot decided to turn right through me, but I didn't get killed or seriously injured which is what could have happened those times or in a dozen or more near misses.