昨天发生了一起严重的交通事故。

A serious traffic accident occurred/ happened yesterday.

今天早上发生了交通事故。

A traffic accident occurred this morning.

早些时候的交通事故过后，现在交通通畅些了。

Traffic is now moving more freely following an earlier accident.

近年来致命交通事故发生率已经下降。

Fatal road accidents have decreased in frequency over recent years.

有关一起恶性交通事故的报道开始陆续传来。

News of a serious road accident is just coming in.

警方今天开展了一场减少道路交通事故的运动。

Today police launched a campaign to reduce road accidents.

每七次交通事故就有一次是驾车者困倦造成的。

One in seven accidents is caused by sleepy drivers.

交通事故的数字与交通量的增长成正比。

The number of accidents is proportionate to the increased volume of traffic.

所有交通事故中有10%是酒后驾车造成的。

Alcohol is a contributory factor in 10% of all road accidents.