Which of the following is not considered a physical obstruction or environmental condition contributing to a crash?

The identification of a person as not being a physical obstruction or environmental condition contributing to a crash stems from the distinction between inanimate obstacles and living beings. A physical obstruction typically refers to objects or conditions that can impede or alter the flow of traffic, such as animals, potholes, or adverse weather conditions like wet pavement.

A person, while they may inadvertently cause a crash by being in the roadway, is considered a variable that interacts with drivers and their decisions rather than an obstruction or environmental condition in the same manner as a pothole or wet pavement. In traffic safety analysis, a person’s presence is often treated differently because it involves human behavior and decision-making, rather than purely physical or environmental factors. Thus, the correct choice emphasizes the context of physical obstruction that is usually static and not influenced by human actions or presence.