The **circumstantial signaling elements** are those that **modify the normal use of the road** in specific situations. This means that their function is to adapt to changing traffic or road conditions to ensure safety and the proper flow of vehicles.

- **Beaconing signals**: These signals, such as lights and devices, are used to highlight roadworks and obstacles on the road. They indicate the direction to follow and prohibit passage in certain areas, thus modifying the normal use of the road.

- **Panels with changing messages**: These panels are placed on roads and their information varies according to traffic circumstances. They can warn about dangers, give recommendations or instructions that drivers must follow, adjusting the use of the road to present conditions.


In summary, these elements are crucial for adapting traffic to specific situations, such as roadworks, accidents, or adverse weather conditions, thus ensuring safety and efficiency on the road.