The term 'Mountain Road' can be broken down into two crossword solutions: PASS (4 letters) and ESS (3 letters). A PASS is a route through a mountain range, usually consisting of a gap or low point between two peaks. It is often used as a route for transportation, such as a road or railway. An ESS is a type of mountain road that winds up and down the side of a mountain, often with sharp turns and steep grades. This type of road is often used to access remote areas or to provide scenic views.