I am back in Shanghai for Chinese New Year. This year 31st Jan is the New Year, and 30th is the New Year's Eve. Usually during the week before New Year, many workers who don't permanently live in Shanghai go back to their hometown. Guess how is the population decreased? It's one-third to half. That means, during the "Golden week" after New Year, the traffic pressure is much lower than the rest of the year. Driving becomes much more convenient than public transportation during this time period.
So I rented a car.
After drove for a couple days, there is one thing to mention. We actually have a "diamond sign" on the road. The diamond sign is exactly the same as the "carpool lane sign" in United States. But does it also means carpool?
Short answer is NO. There is no carpool lane in China.
Actually I don't recall the meaning of that diamond sign. I don't even remember whether it appeared in the driving license exam. Then I did a little research. It turns out that the diamond sign means "slow down", usually before a crosswalk. It is probably equivalent to "PED XING" sign in California.
Well, I would say it is useless, since no one obeys it. The driving culture in China is that people who walk in street should be careful of the cars passing by, not the other way around. Most drivers don't wait before a crosswalk until it is clear. They always try to squeeze into the crowd and make room for them to go through. Sometimes they have to do so, because of the traffic.
In a word, just ignore the diamond sign when you drive in China.