What does "One-way, please." mean in English for Spanish?

In English for Spanish, "One-way, please." means:

Ida, por favor.

Listen to "One-way, please.": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 3, Scene 6