Sober Ride is made available over the holiday season.If you unexpectantly or expectantly drink a few too many drinks, you might want to call "Sober Ride" . The program runs from 10pm-6am over the winter holidays and offers free rides for anybody 21 and over.

• Why would this program be useful (in microeconomic terms)?
• What effect might the age requirement have?
• Could there be any moral hazards or added externalities caused by Sober Ride? Graphs required.