The traffic signals along Factoria Boulevard in Bellevue, Washington, generally don't flash the same length of green twice in a row, especially at rush hour.
根据上下文,green的意思应为绿灯的意思,而green本身没有绿灯的意思,这里是省略了light吗?即本身应为green light.
是省略了 signal。signal 有信号灯的意思。
《牛津高阶》:
 a piece of equipment that uses different
coloured lights to tell drivers to go slower, stop, etc., used especially on
railways and roads(尤指铁路和公路上的)指示灯,信号灯,红绿灯
再看第二句,也可知省略了 signal:
The traffic signals along Factoria Boulevard in Bellevue, Washington, generally don't flash the same length of green twice in a row, especially at rush hour. At 9:30am, the full red/yellow/green signal cycle might be 140 seconds.
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