How many seconds is the shortest green light in Shanghai stays on? How many seconds is the longest it stays on?

The traffic lights in Shanghai are only ten seconds short, such as at the intersection of Huiwen Road and Qiujiang Road in Jing'an District. The red light can last up to three minutes. Once on a Friday night, I was traveling westbound along G204 Zhennan Road. When I was about to turn left at the intersection of Qilianshan Road, I just missed a green light and waited for 169 seconds. What's even more outrageous is that on Friday night, I got off the Jinshajiangxi Road exit of Jiamin Elevated Road and waited for 185 seconds when I turned left, fifty or sixty seconds in each direction. Some traffic lights in Shanghai are really long. There are also very long red lights at the intersection of Zhongxing Road, *** and Xin Road. Of course, there are also roads with long green times. On Jiaotong Road in Putuo District (intersection of Hengfeng North Road and Zhongxing Road ~ G204 Zhennan Road), each green light lasts for more than 90 seconds, with the longest being about 140 seconds. Although there are many traffic lights on the 6-kilometer road, the red lights are usually red. The lamp will only eat two or three, and the time is less than 50 seconds. Most of them can leave after waiting for 20 seconds.