Drunk driving is very stupid...
I'm not a fan of these checkpoints, and I do my best to avoid them if I somehow come to know that one is around.
Why? I was driving along fairly late at night when I saw this distant scene of flashing lights and what looked like the elevated bed of a flatbed towing truck in the distance. To me, it looked like an accident and nothing that I wanted anything to do with, much less interfere. So I turned around rather hastily in a parking lot (without signaling my intention) and was almost through it when this police car (no lights of any sort on, not even its headlights) snuck up behind my vehicle. Turns out the police really weren't very happy that I'd turned around, and they also weren't happy that I hadn't signaled. (Do you believe that was the only reason? I don't. I'm sure they thought I was possibly drunk and looking to dodge the checkpoint.)
That's how I got the only warning on my driving record...and to be quite frank, it made me mad. I really call into question how putting a road block right near a busy intersection in the dead of night is any less potentially dangerous than a drunk driver.