Given the bumpiness of the road ahead, you might be better off with a crash helmet.

考虑到你面前簸道路，你最好还是配个头盔吧。

So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.

崎不平道路，逐步升高海拔，和很长时间使段路程成为了最艰难一段。