This is the literal "gridlock" problem, which can lock up a road system. The US had that problem in some cities until New York City introduced "Don't Block the Box" around 1980. It took a PR campaign, and, some ticketing, and painting a big box with diagonal lines across some intersections, but eventually drivers got the idea to not enter the intersection until they had a way out of it. San Francisco is starting to have gridlock again, and a new "Don't Block the Box" campaign was started in 2014.
I live in the Seattle area though, not NYC.
"In this business there are very few problems that can't be solved with some yellow paint and a little bit of common sense." - Henry Barnes, NYC traffic commissioner.
[1] https://twitter.com/moi_qataren/status/643829644253261824
Also, I've never seen a traffic cop actually pull someone over or do enforcement at all (maybe some DUI checkpoints, that's it!). If it wasn't for the cameras, no laws would ever get enforced. They only enforce parking laws a couple of times a year, so many two lane roads have become one lane as citizens take advantage of a lack of parking enforcement and a lack of cheap parking.
People in china are already ok with Uber, didi, and of course taxis. The private car was more about prestige and convenience (availability), not sure what to do about the former, but the latter is fixable easily enough.
I am not sure about U.S, but my guess is that the cities started to grow a little bit later, the people probably looked at the European kings cool-looking roads, and probably decided that they could do even better and just went for an even cooler looking grid instead just some avenues scattered here and there!
- Drivers in Beijing drive slowly when there's heavy rain
- The sheer number of cars
- Drivers in Beijing advance into traffic-light controlled intersections even when the path ahead of them is blocked, causing a junction to get blocked up, even when all lanes leading away from it
I'm not sure what the other causes were (I heard that road space had just been reduced by the addition of a bus lane on the third ring road). I'm not sure what made that day much much worse than others (and it wasn't just me - I had a friend report a similar speed coming from a different part of the city).
I really wish Beijing had yellow boxes, and strong enforcement of not-stopping-in-junctions, like in London: https://tfl.gov.uk/modes/driving/red-routes/rules-of-red-rou....
I wish even more that the problem of humans needing to drive were solved.
But I'm not sure "Self driving cars are much more valuable to China than the US" is true. Each has a similar number of cars overall. China might skew more towards urban. But the cost for a full-time driver in China is 15%-25% of what it would be in the US, so the amount of GDP replaced by self-driving cars would be higher in the US, no?
Moreover, the lack of parking won't be solved by self-driving cars alone. People who can afford their own car will need to be persuaded to use car-sharing services instead. Without this, people will still want their cars to be near where they sleep, meaning that unused cars will still be jamming up the city whilst unused.