Have ye not asked them that go by the way? - Travelers, who have passed into other countries, and who have had an opportunity of making observations, and of learning the opinions of those residing there. The idea of Job is, that they might have learned from such travelers that such people were "reserved" for future destruction, and that calamity did not immediately overtake them. Information was obtained in ancient times by careful observation, and by traveling, and they who had gone into other countries would be highly regarded concerning point like this. They could speak of what they had observed of the actual dealings of God there, and of the sentiments of sages there. The idea is, that "they" would confirm the truth of what Job had said, that the wicked were often prosperous and happy.
And do ye not know their tokens - The signs, or intimations which they have given of the actual state of things in other countries, perhaps by the inscriptions, records, and proverbs, by which they had "signified" the result of their inquiries.

Have ye not asked them that go by the way? - This appears to be Job's answer. Consult travelers who have gone through different countries; and they will tell you that they have seen both examples - the wicked in great prosperity in some instances, while suddenly destroyed in others. See at the end of the chapter, Job 21:34 (note).
Do ye not know their tokens - Mr. Good translates the whole verse thus: "Surely thou canst never have inquired of men of travel; or thou couldst not have been ignorant of their tokens. Hadst thou made proper inquiries, thou wouldst have heard of their awful end in a thousand instances. And also of their prosperity." See at the end of this chapter, Job 21:34 (note).

Have ye (q) not asked them that go by the way? and do ye not know their tokens,
(q) Who through long travailing have experience and tokens of it, that is, that the wicked prosper, and the godly live in affliction.

Have ye not asked them that go by the way?.... Did you not ask every traveller you met with on the road the above question? not which was the way to Job's house, which they knew very well, but in what condition that and his sons were? or what was the case of him and his family? and what was his character? or what was thought of him now since his unhappy circumstances?
and do ye not know their tokens? by which it might be known in what a plight he and his family were, and what were the marks, signs, and characters they gave of him: "have ye not asked?" &c. the sense seems to be this, that if they had not asked, they might and should have asked of travellers the above things relating to himself and family, and then they would not have needed to put the above question about his house and tabernacles; or, if they had inquired of his character of any travellers, they would have given them it, that he was a generous hospitable man, a man truly good, strictly just and upright, and not the wicked man and the hypocrite as they had traduced him; for Job's house had been open to strangers and travellers, and he was well known by them, and they were ready to give him a good character, see Job 31:32; or, if they had inquired of them concerning the stately houses and palaces of wicked men that had lived in times past, whether there were any of them standing; they could have told them they were, and where they were, and given them such signs and tokens, and such proof and evidence of them they could not deny; and indeed, if they had been inquired of about the thing in controversy between Job and his friends, concerning the prosperity of the wicked, and the afflictions of the godly, as they by travelling became acquainted with persons and things, and made their observations on them, they could have easily pointed out instances of wicked men living and dying in prosperous circumstances, and of good men being greatly afflicted and distressed, if not all their days, yet great part of them; and they could have given such plain signs and tokens, and such clear and manifest proofs of those things, as could not have been gainsaid: and this may be understood of travellers in a spiritual sense, and who are the best judges of such a case, and are travellers through the wilderness of this world, and pass through many tribulations in it; and, being bound for another and better country, an heavenly one, are pilgrims, strangers, and sojourners here; have no abiding, but are passing on in the paths of faith, truth, and holiness, till they come to the heavenly Canaan; if any of those who are yet on the road, and especially if such could be come at who have finished their travels, and the question be put to them, they would all unite in this doctrine, which Abraham, the spiritual traveller, is represented delivering to the rich wicked man in hell; that wicked men have their good things in this life, and good men their evil things, Luke 16:25; and particularly would agree in saying what follows.

Job, seeing that the friends will not admit him as an impartial judge, as they consider his calamities prove his guilt, begs them to ask the opinion of travellers (Lamentations 1:12), who have the experience drawn from observation, and who are no way connected with him. Job opposes this to Bildad (Job 8:8) and Zophar (Job 20:4).
tokens--rather, "intimations" (for example, inscriptions, proverbs, signifying the results of their observation), testimony. Literally, "signs" or proofs in confirmation of the word spoken (Isaiah 7:11).

Them - Any person that passes along the high - way, every one you meet with. It is so vulgar a thing, that no man of common sense is ignorant of it. Tokens - The examples, or evidences, of this truth, which they that go by the way can produce.