- symmetry (Kam Tin Bypass)
- has precedent; see Tseng Tau (Sierra Sea) Sai Sha Road
- strong significance of (recently-moved) park-and-ride access (at least until Northern Link is complete)
- several confirmed neighbourhood development

I must clarify I later rethought about the "park and ride" point raised by @kingkinghk and thought it to be reasonable, at least until Northern Link is complete. But attitude of MTR makes this fishy.