spillback 排队溢出

Spillback is the full or partial blockage of an intersection by one or more cars that don’t make it through before the traffic lights turn red. 

“排队溢出”指的是交叉路口被一辆或多辆车完全或部分堵住，导致交通灯变红前路口一直无法通行的状况。

Spillback occurs when a street block is so jammed with slow-moving or stopped vehicles that it has no room for any entering traffic, which frequently "spills back". 

当街区挤满缓慢前行甚至停止不动的车辆，也就没有空间留给其他车辆驶入，这时就经常会发生“排队溢出”。

我们平时也常用queue spillback来表示下游交叉口车辆排队蔓延至上游交叉口的交通现象。