What should you anticipate when you see this road sign?

This warning sign in Germany indicates a risk of fallen tree branches on the road, especially in areas with overhanging trees. Drivers should be prepared for hazards such as vehicles ahead swerving or braking suddenly to avoid branches. That means you should watch out for all of the following: vehicles may swerve out to the left, may brake unexpectedly, and you might encounter tree debris. Your answer is fully correct. Remember: reduce speed and increase your attention when you see this sign to react safely to any of these dangers.