There's another obvious solution, wait a few years and the end of cheap oil will fix traffic. Then the countries that built themselves around roads, cars and cheap oil will face larger issues (mostly US and Australia IIANM).
The worst part is that this had been foreseen and warnings have been made but nothing is done to deal with it.
If you wait a few years you'll have electric cars that are independent of cheap oil. And there will still be traffic.
Perhaps it will no longer be soul-destroying because you'll be able to watch a movie, take a nap or get work done on your PC in your self-driving car.
There will be no end to cheap oil in the next 50 years. As demand decreases due to electric cars we'll see nearly 30-40% of the use of crude oil going away. The world has absolutely massive reserves of crude.
The worst part is that this had been foreseen and warnings have been made but nothing is done to deal with it.