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Well in Warsaw system is a lot better. It is much easier to distinguish regular line (like 1xx, 2xx, 3xx) from semi-express (4xx, 5xx) and "true" express (E-x). For example, it was quite difficult not to get on 42grt (now 78) which doesn`t go through Salininkai like regular 42 did. And the only difference is inverted number colors (white background with blue number for regular, vice-versa for express). What about destinations on line tablet / board - no one reads that :(.
I referred to the last sentence - 4xx/5xx routes in Warsaw are not-so-express too, they usually skip just a few stops located in the middle of nowhere...