Airport Engineering
According to the International Civil Aviation Organization (I.C.A.O.) the strength of runway pavements, have been coded by

First seven numbers
Last Seven English alphabets
Seven English alphabets
First Seven English alphabets

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Airport Engineering
Effective length of a runway is the distance between

Ends of the clear way on either side
Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway
Ends of the runway
Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway

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