This style usually is used by newcomers so that they do not have to
calculate distances in their heads while driving and getting used to reading
the roadbook.
Event organizers have the option to disable the "countdown style" feature in the event settings for any class they
choose.
The distances in the roadbook are recalculated and updated automatically
while you ride.
You can enable it in the app settings.
Countdown style roadbook background colors explained:
< 300 meters left until the tulip:
green
< 150 meters left until the tulip:
orange
< 75 meters left until the tulip:
red
< 10 meters left until the tulip:
blue
This is how countdown style looks visually while riding with autocroll
enabled: