Well, I have personal experience with 2 racers (one a pro) and both point out road hazards.
Last week, I had the unpleasurable experience of driving by a large group of riders that are part of the group I ride with on Wednesdays when I can. This group is more casual, slower, but has experienced riders, and often the faster people join them to socialize on Mondays. There is one man, who as long as I have known him just weaves everywhere. He is a terrible rider. Passing him, in a car, going up a hill was scary for me. The next week, when I went to the regular Wednesday ride, I told the ride coordinator and she took immediate action, in that I heard her discussing this with someone else. He is going to be banned from riding with the group.