After completing a speed trap or danger sign, there is a popup that says “You’re in the top 100%”. This information is only useful if there are other players on the leaderboard and should not be shown if you’re the only one.
Related: If you change the leaderboard from Friends to Global, it would be nice if the game could remember that preference and show my global ranking for the next speedtrap, instead of showing “You’re in the top 100%” again.