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The work zones on the United States highway system have created an inevitable disruption on regular
traffic flows and resulted in traffic safety problems. Understanding the characteristics and major causes of
highway work zone crashes is a critical step towards developing effective safety countermeasures in highway
work zones. In 2004, the Kansas Department of Transportation (KDOT) initiated a project (K-TRAN Project No.
KU-05-01) to study the fatal crashes in Kansas highway work zones between 1992 and 2004. The study results
including crash characteristics and major crash contributing factors were published in Bai and Li (2006). Built
on the previous success, KDOT sponsored this research project (K-TRAN Project No. KU-06-01) to further
study the injury crashes during the same period in Kansas highway work zones.