The phrase "green light" means that you have permission to go ahead or proceed with something. It is often used to indicate the approval or acceptance of a certain activity or plan. It is like a signal to start or move forward. Full definition
I can't wait for when legal gives green light to the funding chart and backers numbers information release. (dereksmart.com)
More and more coach - built cars are getting green lights for production, leading us to believe that the market is becoming more open for cars of such unique quality. (topspeed.com)
I have been following this project since it was up for green light on steam. (metacritic.com)