周五晚高峰时，城市的主干道总是堵得水泄不通。

On Friday evenings, the main streets are always ___bumper-to-bumper traffic.

高峰时段，高速公路上的车辆一辆接一辆地排成了长龙。

During rush hour, the traffic on the highway was ___bumper-to-bumper.