Meanwhile, on the London Underground, the lengths of all sets of stairs down to platform level are described as "equivalent to 15 floors" irrespective of how hi

Meanwhile, on the London Underground, the lengths of all sets of stairs down to platform level are described as "equivalent to 15 floors" irrespective of how high they actually are: https://www.youtube.com/watch?v=pBTvmrRGlbE&t=41s https://www.youtube.com/watch?v=pBTvmrRGlbE&t=41s