1. You see signs for passing lane ahead.
2. The person riding in front of you becomes frighteningly close all of a sudden.
3. The great song you have in your head starts getting slower and slower.
4. You see signs for scenic outlook/view point/vista/cliff overlook…. basically anything high up and looking over stuff.
5. Your back tire starts to feel really low.
6. The cyclists passing you the other way are smiling at you.
7. The drivers passing you the other way are looking at you in horror.
8. You are currently going downhill.