[brian51]

This than is my reply to Pierre's previous post about the :

This will be the final post about the highways, disappearing cars and Sims looking for work in other cities,

What i think is happening is that the red is indicating  a lot of traffic thru the city Borders, and this is why the congestion graph
is showing red. This would be fairly common as typically we see a lot of traffic with inter -city situations ..

My guess is that the traffic reporting is inaccurate even though the actual traffic is very heavy.
I think this would be consistent with what I have observed with game bugs with the city's borders/ connections.

But just my "take" on this interesting traffic situation ..