Due to road construction, our bus is being re-routed.

re-routed 是动词 re-route 的过去分词形式，表示"被重新规划路线"。re-route 由前缀 re-（表示"重新"）和动词 route（规划路线）组成，字面意思是"重新规划路线"。在被动语态中表示公交车路线被临时改变。