Over the past few months, there have been random complaints from Google Maps users about the live traffic data. In short, people are saying that when they zoom into see more detail on the red colored traffic indicators, the color changes to another color.
A Google Maps Help has posts from three different Google Maps users over the course of three months. Clearly, this cannot be a wide spread issue, because of the very few posts. So either this is a user generated error, where the user is zooming into the wrong location or the traffic data has actually changed on the zoom refresh -- or Google has some sort of bug.
Have you ever noticed this as an issue? I tried to replicate this issue, but failed.
Forum discussion at Google Maps Help.