[译] 昨天路上交通十分拥挤。
[误] There was a lot of traffics on the roads yesterday.

[正] There was a lot of traffic on the roads yesterday.
[注] 名词 traffic 作“交通”解时，不用复数。如：Are the streets crowded with traffic? 路上交通拥挤吗？/Police control the traffic in large cities. 大城市交通由警察指挥。