How should temporary traffic control devices be placed in relation to existing road signs?

Temporary traffic control devices should be placed in a manner that supplements existing road signs without obstructing or blocking them. This approach ensures that important information being conveyed by both existing permanent signage and temporary devices is clearly visible to drivers. Clear visibility is crucial for maintaining safety and proper navigation, especially in dynamic environments, such as construction zones or areas where road conditions may change rapidly.

This practice helps to minimize confusion for motorists, as they can see both the existing signs and the temporary devices. Using temporary devices to enhance, rather than replace or obstruct, existing signage is a fundamental principle in traffic control management to maintain an organized flow of traffic while maximizing safety.

In other contexts, completely replacing signs or obstructing them can lead to unclear messages and may increase the risk of accidents. Similarly, placing signs upside down would not provide clarity and might confuse drivers further, detracting from the safety measures intended by the temporary control devices. Therefore, the approach of supplementing without blocking is critical for effective traffic management.