I don´t have a problem with the traffic, but I wonder, why the blinkers are useless. If a car is next to me on the lane for another highway/parking-lot/Whatever, I need to stop or slow down, because the traffic doesn´t react to the blinkers...
They also change the lane immediately if you load a quicksave (Not funny if you are next to them).
Some cars are changing two or three lines at once.