Transport ministry spokesman Bambang Ervan added: "It may have been mechanical.
交通部发言人Bambang Ervan补充说：“可能是机械问题。
2
Subgrade and pavement mainly bear the vehicle loads under the transport conditions. The actual working state of the subgrade and pavement has difference from the static mechanical calculation system.
路基路面结构在运营中主要承受交通车辆的作用，它的实际工作状态与现行的静态力学计算体系有较大的差距。
3
Block in the transport process protection coatings to avoid mechanical damage. If suffer much, the all mechanical damage should be repaired before final inspection.