Multiple line-ups is a technique employed at some busy airports to expedite the departure of aircraft from the runway. It concerns departing aircraft being instructed to line up on the same runway at different positions using different access taxiways. Multiple line-up is a significant capacity enabler when implemented in line with the ICAO recommendations and phraseology.
ICAO Provisions
The procedures for application of multiple line-ups are described in ICAO Doc 7030, Part 3 - European Regional Supplementary Procedures, Section 3.1.1:
Line-up instructions may be issued to more than one aircraft at different points on the same runway taking into account that intersection take-off criteria shall be complied with, provided that: