Isaiah 15:3-4. The voice of him that crieth in the wilderness, Prepare ye the way of the Lord, make straight in the desert a highway for our God. Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain.
Roads of some kind must, have existed in former times in Palestine, though nothing worthy of the name is to be found there today. The use of chariots, and the opening and preservation of the way to the Cities of Refuge, and such expressions as are found in this text, seem to imply a knowledge and a use of artificial roads.
It has been the custom from ancient times for Oriental monarchs, when wishing to travel through their dominions, to send men before them to prepare their way, by removing stones (see Isa. 62:10) leveling rough places, filling up hollows, and making the road pleasant and easy for the distinguished travelers. Semiramis, on one of her journeys, coming to a rough, mountainous region, ordered the hills leveled and the hollows filled, which was done at an enormous cost. Her object was not only to shorten the way, but to leave to posterity a lasting monument of herself. There have been modern instances of a similar character, though not involving so much labor and expense.
In Matthew 3:3, Mark 1:3, Luke 3:4, John 1:23, this passage is applied to John the Baptist, who, as a herald (see note on 1 Corinthians 9:27, #866) preceded the Messiah to announce his coming and to have the way prepared.