Dogtrousers
Kilometre nibbler
I'm glad someone else has a sufficiently trivial mind to give this some thought.Only the occasional on-screen counting-up timer seen at summits and other key points means "G1 passed the point where G2 is right now X minutes ago". The ones along the top of the screen seem to mean "if the finish line was where G1 is right now, we estimate G2 would finish at +whatever".
Now think about the time gaps shown on time trials