A lot of these signs often go unnoticed and we simply attribute them to an incompetent
driver- mumble some disgruntled insults, go around them and continue on our journey. We will often even ignore the obvious cues that a driver has been drinking rather than reporting them to the local police. We try to maneuver around the driver in the safest manner possible and get as far away from them as we can. The proper way to deal with a suspected drunk driver is to not pass them- stay a safe distance behind the driver so as not to be involved in any collision and immediately contact the police.