Yup. In Tucson they put "men working" signs right in the middle of the bike paths.

I stay off of multi-use bike/pedestrian/small dog/little-old-lady paths as much as possible. I figure they don't want me whizzing by them as much as I don't want them wandering in my path. The only time I venture out is early early in the morning, before Aunt Bessie & Peaches hit the path.