In Yellowstone, if there are bears near a road, there will, unfortunately, be people too close to the bears.
It must be an unwritten rule of some kind. Why else would people violate the posted rules, not to mention common sense?
Safely Viewing Wildlife in Yellowstone (National Park Service)
Do not approach bears or wolves on foot within 100 yards (91 m) or other wildlife within 25 yards (23 m). Keep a safe distance from all wildlife. Each year, park visitors are injured by wildlife when approaching too closely.
- Use roadside pullouts when viewing wildlife.
- Use binoculars or telephoto lenses for safe viewing and to avoid disturbing them. By being sensitive to its needs, you will see more of an animal’s natural behavior and activity. If you cause an animal to move, you are too close! It is illegal to willfully remain near or approach wildlife, including birds, within ANY distance that disturbs or displaces the animal.