What is meant by the term 'transition' in bridge safety features?

The term 'transition' in the context of bridge safety features specifically refers to the connection between guardrail and bridge railing. This connection is crucial because it ensures a seamless transition for vehicles as they move from the roadway to the bridge and vice versa. Properly designed transitions help in maintaining vehicle control and minimizing the risk of accidents, particularly in scenarios where vehicles may encounter differences in height or alignment between the road and the bridge.

The design of this transition area is important for safety, as it must accommodate for potential impacts while providing an adequate barrier to prevent vehicles from going off the bridge or into areas that could be dangerous. This particular aspect of road design ensures that safety features operate effectively, providing continuous protection as vehicles cross from one structure type to another.

In contrast, the other options presented, such as changes in road surface type, signals to reduce speed, or adjustments in lane width, do not specifically characterize the concept of a transition in bridge safety features and relate to different aspects of roadway design and traffic management.