There is a way of analysing junctions that makes their differences obvious, and it is not the one most people use.
The usual way is to think about rules —…
The coach differs from every other mode in one respect: it travels through the landscape at ground level, stopping at ordinary places, rather than passing over or under it. Here…
The mistake is treating each journey as a separate problem to solve. The system has a logic, and learning the logic once is far quicker than working out ten routes…