Three fives, and always mid-motion: on the odometer when you pull over, on the room number of the place you are staying for the first time, on the counter you reset to start again. 555 shows up when something is already in the act of changing.
Five sits at the hinge of the count, halfway through and leaning. Tripled, it describes a change already underway rather than one on the way, which is why it tends to show up after the decision instead of before it. The number runs late by design. It names the move you have already made.