We put lights on the front of trains so we can see them approaching in a tunnel. And we buy insurance for the accidents that occur despite such precautions. General contractors try to manage their project risks by taking precautions to avoid accidents, but they also require subcontractors to name them as “additional insureds” on their general liability or project-specific insurance should an accident happen. Suppose you’ve done that. An accident follows: Your subcontractor injures a person on the project site as a result of your own workers’ failure to warn. You’re covered, right? Better slow down.