Two Paths

There are two paths ahead, but only one is safe. The guards know which way is safe, but one guard can only tell the truth while the other can only lie, and you don’t know who’s who.  What is one question you can ask to find the safer path.

• "Which way is safer?"
•  "Which way would you go?"
•  "If the other guard told you to go left, would you do it?"
• "Are you telling the truth?"
• "Which way would the other guard tell me is safer?
• "What did you tell the last traveller?"