Regardless of where you're driving, there's a possibility you could find yourself funneled into a DUI checkpoint. If this happens, your heart will begin to race and your mind will think the worst. This holds true even if you've only consumed one drink.
The biggest concern with a DUI checkpoint is that you'll do something that gives the officer more reason to believe you're under the influence. Of course, if you've been drinking, the chance of making a mistake is much greater.