MCPON put out an outstanding public service announcement for this weekend. Check it out:
I couldn't agree more. Like I told my crew every Friday at quarters on the pier - don't allow yourself to end up in a position where YOU have decide if YOU are "sober-enough" to drive home after YOU've already been drinking. Drinking impairs your judgment and you're likely to make a bad-call in the interest of convenience.
Follow MCPON's advice and HAVE A PLAN how you are getting home BEFORE you go out.
That being said, I have also frequently told my crew that I know sometimes plans go awry. You had a designated driver and next thing you know, you look across the bar and there is your "designated driver" putting down shots of tequila.
That's okay. Not your fault. There are other SAFE alternatives available to you such as calling a taxi cab or a friend. I think there are a lot of people like me around who would rather you called at 1 a.m. in need of a safe ride home than have to attend your funeral because you didn't call / didn't want to wake me up at 1 a.m.
Along the same lines, here in the DC area, there is a safe ride home program. From 10 p.m. Sunday July 4 until 6 a.m. on Monday July 5, call the SoberRide program at 1-800-200-TAXI to get a free ride home (up to a $50 fare). If you aren't in the DC area, then google it for your home town. Take the number with you JUST IN CASE.