Perhaps Roads in Mountains heading is misleading. Infact I agree its misleading.
Please view translations of the ayat presented from various sources:
081.003
YUSUFALI: When the mountains vanish (like a mirage);
PICKTHAL: And when the hills are moved,
SHAKIR: And when the mountains are made to pass away,
Also view the tafsir of this ayat;
وَإِذَا ٱلْجِبَالُ سُيِّرَتْ](http://javascript:Open_Menu())
and when the mountains are set in motion, [when] they are blown away from the face of the earth, becoming as scattered dust,
Source Tafsir Aljalalayn
I guess above writings are an open book.