1. It would be better to simply return to using `=motorway_link` by considering this as inside an interchange
2. Chek Lap Kok Rd is `=secondary` by considering continuity through East Coast Rd until the Scenic Rd roundabout. You now have a `=primary` changing to `=secondary` when merging with a `=tertiary` for no reason. The southbound  is based on connecting with Tung Wing Rd to connect with `=primary` Airport Rd northbound, and Cheong Hong Rd (for airport terminal). 