What are two common terms used to describe traffic signal supports and signal heads?

The use of the terms "rigid" and "free-swinging" typically refers to the design and behavior of traffic signal supports and signal heads in the context of traffic signal systems. Rigid supports are designed to maintain their position and orientation regardless of external factors, such as wind or impact. This ensures that signals remain visible and correctly aligned, which is critical for safe vehicle and pedestrian navigation. Free-swinging supports, on the other hand, may be designed to move or bend under certain conditions, which can help reduce the risk of damage during impacts or adverse weather but might pose visibility issues if they swing too far.

Understanding these terms is essential for signal technicians when evaluating the types of signal supports and heads that are most appropriate for various traffic situations. This knowledge can influence decisions regarding installation and maintenance practices to enhance safety and functionality.