You have been cited under § 3.06 of the Public Courtesy Code: Premature Horn Deployment
THE LIGHT JUST CHANGED.
The signal turned green four-tenths of a second ago and this vehicle is already leaning on the horn. The horn is a safety device. It is not a stopwatch, a mood, or a way to tell an entire block that you have somewhere to be.
This is not a fine. There is no fine. Think about what you did.