Low Visibility T/O
 

Genuine doubt for ATC experts: Which is the spacing between the RWY center line lights before a displaced threshold on a CatIII aproved RWY? The FAA standards seems to give a possible selection between 30mts for approach lights and 15mts for take off, is this correct? Any supporting documents for this issue? Thanks!

For CATIII operations and take-off in RVR below 400m spacing should be 15m and no centerline lights before runway threshold lights.
CAP168 Licensing of Aerodromes, Chapter 6 page 18

ICAO allows white approach light centreline barrettes at 30m spacing to be used pre-landing threshold for Cat III take-offs instead of 15m spaced runway centreline lights. Ref Annex 14, Chapter 5, page 55.