He hit the back of a truck carrying construction gack?
他跟一辆运送建筑钢筋的卡车追尾了?
英语百科
Gack
Gack[ɡat͡sk] (German:Kolonie Berkenbrügge) is a village in the administrative district of Gmina Drawno, within Choszczno County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 9 kilometres (6mi) south of Drawno, 22km (14mi) east of Choszczno, and 82km (51mi) east of the regional capital Szczecin.