Mother's strange liking for cliffs

Last night I went to a friend's son's wedding at the far end of the city. So I used the NKVE Duta exit. Driving through the stretch of the expressway with my son, I recalled Mother used to request me to drive her through that stretch of the expressway just to see the cliffs on both sides of the road. The road was a cut - through into some high hills, resulting in high cliffs flanking both sides for quite a long strech. Mother used to marvel at the sight of the cliffs and she used to wonder aloud how the engineers were able to do it.