Halliday & Matthiessen (2014: 566-7):
With prepositional phrases and adverbial groups of place and time there is also a hypotactic relation of enhancement, with the special semantic feature of ‘narrowing’, as in tomorrow before lunch. Examples, starting with a constructed sequence:(it’s) | α upstairs | ×β to the left of the landing | ×γ in the main bedroom | ×δ against the far wall | ×ε in the small cupboard | ×ζ in the top drawer | ×η at the back right hand corner |
Starting from Narmada, || take the main turn-off south towards Praya.
From Beleka the road continues north, || rejoining the main east-west axis near Kopang, about 30km east of Mataram.
You know || what’s happening tomorrow at five o’clock, don’t you?