We've found out a lot in the last 40 years from archaeology around the world about how much smarter, more organized, and more thoughtful than we thought. The pacific rim had a bunch of very large previously undiscovered trading populations and they were not small ones. There are areas in central and south America where we have found a lot more empty ruins (vast numbers) that nobody knew were there before and which would have supported large numbers of people and in a very structured setting - multiple cities with linking roads, and so on.
We've long kind of thought our ancestors weren't that bright, but I doubt the human intelligence is greatly higher than any other time in the last 4K years at least (maybe a bit because the plastic brain may adapt to our new requirements and that might show out in some tests). I have no trouble believing that some problems of nations are still with us from those times.
Traffic jams is one, corrupt government is another, the insanity of a system lacking enough checks and balances, demagogues wanting power, etc. The authors of antiquity also recorded a number of fairly useful understandings of solutions and ways to bolster a society against those sorts of problems.
So it isn't necessarily much of an act to predict 'a traffic jam'.
To predict a 3D traffic jam with flying cars, if you don't know what a car is or what a plane is or that cars might fly one day, might be a bit more of a stretch.