If transfer-only `=bus_station` should have `=customers` , why should the `highway=` inside not have it? On the contrary, the isolation can also be said as a consequence. They should have an `access=` regardless of the layout, because that's the inherent rule of the interchange itself. Tuen Mun Bypass would add a connection with Lung Mung Rd, then there may be a `=service` road connecting the northbound side. 