In a mountainous region:
The side of the mountain is carved to make room for the road. The road is good quality here; broad curves not hairpin turns, no steep slopes, wide enough that two wagons can pass with some room to spare, a sturdy stone ledge on the downslope side.
Carved into the upslope cliff is a proclamation in several writings. If you can translate one, it says:
I, Darius, the Great King, have built this road that you may journey with ease. Remember me before your gods, and pay my tax collectors the proper respects.