Traffic in Rome is chaotic and mad. And I must admit I really enjoy it, although I am happy not having to drive in it.
As a pedestrian there is one important rule; if you cross the road, keep on walking! Then the cars will stop.
As a cardriver there seem to be almost no rules, but somehow it always works out.
Parking in the crowded city of Rome is also not easy. The solution to that is to either have a small car so you can fit it everywhere, and when that does not work, park double.