Do you mean a T-intersection where you are crossing the top of the T and there is no way a car could hit you even if your light is red?

I actually think you should at least slow down and look carefully for pedestrians or bikes who might be crossing in front of you as you pass the stopped cars, especially if there is something for them to get to on the other side, like a store or something. You have to really know the traffic and layout at the intersection in order to determine if it really is safe not to stop.

There is an entrance to a bike trail by my house that is a the top of a T intersection and there is also a heavily used bike lane running along the top of the T. When I'm riding up the T to the entrance, I always have to watch out for overzealous road riders who don't feel the need to stop or even look when the light is red and my light is green. And they KNOW that the entrance is there and that hundreds of walkers, runners, and bikes must cross in front of them, but they don't always pay attention. It's an accident waiting to happen.