Final answer:
The color that warns against a tripping hazard is orange.
Step-by-step explanation:
The color that should warn against a tripping hazard is orange. Orange is a bright color that is easy to see in all light conditions, making it suitable for safety purposes. It is often used on caution signs and the uniforms of emergency workers. Additionally, in Buddhist cultures, orange represents holiness and in the Netherlands, it is used for patriotic purposes.