据联邦道路局说，2008年美国发生的大约37000次严重车祸中超过一半是发生在乡村道路上。

Of the approximately 37, 000 fatal car crashes that occurred in the U.S. in 2008, more than half took place on rural roads, according to the Federal Highway Administration.

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接着结合道路局部特征运用模糊连接度连接断裂路段，最后根据道路走向进一步完善整个道路轮廓。

Secondly the method combines with the road characteristic and USES fuzzy connectedness to join the break road segment, and at last farther process to form the whole road network.

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