Four people were killed when the Nissan sedan car they were traveling on hit a truck on Monday on an expressway in east China's Zhejiang Province, local traffic police said on Tuesday.

The accident occurred at around 4:00?AM on a 145-km expressway linking the provincial capital Hangzhou to the nearby city of Ningbo.

The local traffic police headquarters suspected the accident was caused by fatigue drive, as the sedan car crashed into the 10-ton container truck without realizing the front vehicle had come to a halt in a traffic jam caused by heavy fog.

Heavy fog paralyzed traffic on the expressway Sunday night and Monday morning, and the traffic didn't return to normal until midday.

Investigators said the sedan driver, surnamed Xu, was a native of Yueqing City, Zhejiang Province, and was taking three of his relatives to Shanghai.

(Xinhua News Agency February 14, 2006)