They are set differently in different cities. Here, if your in the intersection while it is yellow, you are good to go. If you go into the intersection After it is red, ticket is a coming. However, here, you can tell which intersections you can blow, as the camera ones all have a blue light on them.
Besides, if it is your first, you can most likely have it differed, and if you don't have a violation in x time, it will be stricken from the records. At least here that is.