It would be very nice if the car traffic moving on the streets could be editable and thus correctable. At the moment, the vehicles are driving wildly, not keeping to the roads and sometimes driving on one lane in opposite directions.
As a scenery designer, this chaotic ground traffic drives you to despair. Especially when building high bridges (which are default only as flat bridges) through which even curves run.
Therefore, please make the car traffic editable - exclude default traffic and insert new car traffic.