Which of the following best describes a deterministic factor affecting crash outcomes?

• A. Controllable, roadway design
• B. Random, unpredictable
• C. No injury
• D. Fatal injury

Answer: (A)

Deterministic factors are elements that will influence crash outcomes in a predictable way because they come from design and conditions that can be controlled. Controllable roadway design fits this, since features like lane width, curvature, sight distance, barriers, and markings are choices engineers can make to reduce crash severity and steer outcomes in a known direction. These factors produce consistent effects when other conditions are similar, unlike random factors such as weather or unpredictable driver behavior that add variability. The other options describe outcomes (no injury, fatal injury) or randomness rather than factors that can be controlled through design.