The context of the following conversation is It was late at night and I was drunk so Sydney picked me up and parked my car.:
Sydney says I drove my friend home last night.  She was to drunk to drive.  I picked her up and parked her car..
The friend responds That's nice of you..
Sydney responds I am usually the designated driver because I don't drink..
The friend responds They can always count on you to be sober..
Sydney responds That's true.  I don't mind driving if that means all of my friends will make it home safety..
The friend responds Drunk driving is such an issue when people are partying..