What do most traffic signs have in common?

Most traffic signs share the common feature of including symbols or words to convey a message. This is essential for effective communication with drivers and pedestrians. The use of standardized symbols and clear text helps ensure that the information is easily understood, regardless of the driver’s native language. This design principle enhances road safety by allowing all road users to quickly comprehend the intended message, whether it relates to speed limits, warnings, or directions.

While bright colors certainly play a role in attracting attention, not all traffic signs utilize bright colors—as some can be less vibrant but still convey important information. Additionally, traffic signs are designed to be visible both day and night, using reflective materials to ensure visibility after dark. Lastly, while many signs are made of metal due to its durability, traffic signs can also be constructed from various other materials such as plastic or fiberglass. Thus, the feature of conveying a message through symbols or words is fundamental to their design and purpose.