Gantry cranes are very heavy, but typhoons have been known to blow them along their tracks, and so when the wind blows faster than 12 meters a second, work stops. The same limit applies to tower cranes.
門形吊車雖然噸位大，但有次颱風來襲，控制室還是被吹得在軌道上跑，因此當風速超過每秒十二公尺時就會停工。