交通拥挤 用英语说

heavy traffic 拥挤的交通,繁忙的交通,车辆拥挤
rush hour (公共车辆的)高峰时间
traffic jam 塞车,交通拥塞
例：There is heavy traffic during the rush hours.
上下班时间交通很繁忙。

traffic-jammed
traffic jams(通俗说法)
high traffic
congested traffic
congestion(更正式)

1、如此拥挤的交通已经成为这个城市的常景了。
Traffic congestion has become a common scene in this city.
2、家住市中心虽然购物很方便, 但是交通很拥挤。
It is convenient to live downtown, but the traffic is very heavy.
3、北京的交通很拥挤。
There are a lot of traffic on the streets of Beijing

拥挤 - traffic congestion
- heavy traffic

塞车 - traffic jam
- traffic hold-up

traffic jams（一般说法）
下面的也行
heavy traffic
busy traffic

busy/heavy traffic

名词，traffic jams 或 traffic tie-up

动词 the traffic is tied up