green light

Definition

A traffic light in its green state (indicating that vehicles may proceed).

Etymology

From the standard red-green color scheme used in traffic lights and railway signals.

Example Sentences

• "The drive home was much faster than usual; somehow we managed to hit every green light."
• "We have a green light on the project. Work starts today."
• "And Crossrail's Class 345 Aventra fleet finally has the green light to carry passengers to Heathrow Airport, after the Office of Rail and Road granted approval for the European Train Control System (ETCS) Level 2 overlay system."