I can understand why you created the subway to rapidly transport people from the centre of London to Box hill rather than plot the entire road route linking these points. I don’t like how the hill is mapped in Elephant castle. I think this may limit your ability to expand the London course and it disturbs my obsessive nature.
If you rode your bike to a subway and went to Box hill your GPS map plot would show a straight line between the 2 subways and start following the road again once you exit.