There are a lot of factors that really complicate this system.
Enforcement focuses on the wrong parameters. Police love to remind us that, "Speed is always a factor." Well, it's certainly the most easily measured one. The trouble is, what speed is wrong? Is it the 5 cars who want to drive 90mph on the freeway, or the 2 cars who want to drive 65 in both lanes? By obsessively enforcing speed limits, police have managed to perversely incentivize the difference in speed between drivers who are willing to risk a ticket, and drivers who self-righteously bottleneck traffic. I have never even heard of the law, "keep right except to pass" being enforced, even though it seems pretty obvious that it would help.
People don't want to drive. People have to drive. That reality perversely incentivizes drivers to minimize effort. There is very little motivating drivers to drive better than they need to. How could we possibly change this incentive? Fear tactics are not working. Threats are not working. This is an open question: what if it has no answer?
Infrastructure demands backwards-compatibility. We can't just build a new part of a city without roads. Where would people put their cars? If people living there didn't have cars, then where could they go? Where could they work? Could anyone visit? Utopia must have a compatibility layer: somewhere that alternative transit can transition to highways. But where? If you have to park your car away from home, then you need to manage the risk of unattended property. If you have to get a ride in someone else's car, is that affordable? If you are going to take a bus, how long will you have to wait? How many busses will you have to transfer between? No matter what we do, the compatibility layer will always be inefficient.
Infrastructure demands infrastructure. The only solution to more traffic is more road. The only solution to more road is longer driving distance. The only solution to longer driving distance is more time in traffic, which is identical to more traffic. The only way to stop growing this system is to stop growing the amount of drivers. How can that be done? In order to become a non-driver, you need a minimum viable alternative, otherwise you will have to drive just like everyone else. In order for alternative transit to be viable, there needs to be enough of it around that it feeds its own infrastructure demand. If alternative transit is built with a highway-compatibility layer, then that compatibility will effectively remove the need for alternative-transit growth. Realistically, alternative transit won't start demanding itself until its utility is equal to the highway system. We can't build that all at once, so how can we overcome the already-present highway infrastructure demand cycle?
No matter how you look at it, the highway system is feeding the worst aspects of itself into its own growth. The only way to change this cycle is to build a lot of alternatives really fast, and make them dirt cheap. It's a political nightmare. Even so, I would much rather live in that nightmare than the one where rubber meets the road.