What is the term for a traffic signal that has been green for a prolonged period?

The term "stale green light" refers to a green traffic signal that has been illuminated for an extended duration, suggesting that it may soon change to yellow or red. This situation indicates that drivers should be cautious, as the traffic light’s duration might mean it is nearing the end of its cycle. Understanding the concept of a stale green light is crucial for safe driving practices, as it prompts drivers to remain vigilant and prepared to stop if the light changes.

This concept emphasizes the importance of recognizing traffic signals beyond their color—assessing how long they have been green can aid in making informed driving decisions. Recognizing a stale green light enables drivers to anticipate potential changes in traffic flow and reduces the risk of running a red light if they are caught off guard.