A lateral thinking challenge

You are in a country where there are only liars and truthtellers, and they cannot be told apart by sight.

You set on a dangerous trip because there is a fork in the road that can lead to either a crocodile swamp (death) or to safety. When you reach the fork, the sign post is gone, but there are two men standing there. One is a liar and one is a truthteller. You cannot tell them apart.

You know that they will answer only one question between them. What question can you ask either of them that will tell you which road is safe?
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Solution Preview

Since we can only ask one question, we need to come up with a question that will result in the same answer no matter which one we ask.

What if we say, “If I asked the other guy which …