Yeah, man. My favorite Chinese highway (so far) is in Qingdao, where they could have built a bridge over the narrow mouth of their bay, but instead built a freeway across the widest part, complete with an interchange connecting to a peninsula in the middle.

from
http://www.panoramio.com/
That's kind of awesome, but also really crazy and probably stupid. Factor in iffy Chinese building standards and it's also pretty scary.
As for the Americans, while the Interstates are great for inter-state travel, they could stand to yank some of them out of their cities, in some cases, and stop building them in others. Besides their funding problems, you're right to cite cases like LA. They could build their way to an absurd conclusion where every bit of space in the city is highway or parking spot and only then solve their congestion problems because nobody lives there any more.