Originally Posted by
Equivocal
Some 25 years ago runway incursions were picked up as an increasing problem and work was done, initially in Europe, on an action plan to prevent these incidents from happening. Amongst the things that the plan said was that any clearance to enter or cross a runway must be explicit and include the runway designator. ICAO later produced a global plan which (I’m pretty sure) included the same provision. Ultimately, it’s up to the individual state whether they include it in the national procedures but many do/did. That’s the reason for issuing both clearances explicitly.
Maybe you're talking about this:
https://www.icao.int/safety/RunwaySa...al_prev_RI.pdf
4.3.2 A requirement to obtain an explicit clearance to cross any runway should be included in the flight deck procedures. This includes runways not in use.
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4.5.6 It should be ensured that ATC procedures contain a requirement to issue an explicit clearance including the runway designator when authorizing a runway crossing or to hold short of any runway. This includes runways not in use.
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4.6 When a taxi clearance contains a taxi limit beyond a runway, it shall contain an explicit clearance to cross that runway, or an instruction to hold short, even if the runway is not in use.
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6.3.7 When a clearance to taxi to a point beyond a runway is received, it must include the authorization to cross that runway. A runway should never be crossed unless an explicit ATC clearance has been received.
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4.2 When a taxi clearance contains a taxi limit beyond a runway, it must contain an explicit clearance to cross that runway, even if the runway is not in use. Where an expected or anticipated runway crossing is required, a means of communicating this to the pilots, at the gate or prior to descent, should be established.
A take-off clearance is itself explicit, since you are entering that same runway, and not implicitly crossing it to get somewhere else. The phraseology does not include a line up clearance along with the takeoff clearance:
TAKE-OFF CLEARANCE
ATC: (call sign) RUNWAY (number) CLEARED FOR TAKE-OFF [REPORT AIRBORNE].
It only sows confusion and ambiguity.