Riddles and Puzzles

Riddles and Puzzles # 9

You are a traveling warrior in a mythical land. In your travels you come to a fork in the road that is guarded by a two-headed dragon. It explains to you that one of its heads always speaks truth, while the other always speaks lies. One of the roads from the fork leads to certain death, while the other leads to safety. You are allowed to ask just *one* question to *one* of the dragon's heads in order to determine which path leads to safety and which one leads to death.

The problem is, you don't know which head speaks truth and which one speaks lies.

What one question can you ask of either head to determine which road leads to safety?