What is an example of something that is not a physical obstruction or environmental condition that may contribute to a crash?

The answer is focused on identifying entities that do not constitute a physical obstruction or environmental hazard. A person, while they may be present at a crash scene or near a roadway, does not represent a stationary impediment or condition that is typically classified as an obstruction or an environmental factor.

In this context, vehicles, animals, and road signs can all serve as actual barriers or hazards that directly affect the roadway environment and driver behavior. Vehicles can block lanes, animals may dart onto roads creating unexpected dangers, and road signs provide critical information for navigation, but they can also become obstacles if they fall, are obscured, or are improperly placed. In contrast, a person doesn’t physically block the road in the same manner; rather, they are a dynamic element that can be involved in or react to various situations but does not inherently serve as an obstruction in the same way as the other options listed.