A transit map is not a photograph of a city. Distances are stretched or compressed, curves are simplified, and rivers may look tidier than they do outside the train window. None of this is necessarily dishonest. A useful map does not aim to reproduce every detail of geography. It aims to help a rider make a correct decision quickly: where to board, where to change lines, and how far one route reaches.

The best maps therefore practice disciplined simplification. Too much realism can confuse, but so can too much abstraction. If station names are hard to scan, transfer points unclear, or colours poorly chosen, even a visually elegant design may fail the person who needs it most: the newcomer reading under time pressure. A map succeeds when it lowers cognitive effort rather than admiring its own cleverness.

This is why transport design often reveals a humane principle. Clarity is not the enemy of complexity; it is how complexity becomes usable. A city may be large, crowded, and intricate. The rider should not have to feel all of that confusion at once.