The Sioux City airport director at the time told me the FAA informed him that the only reason it would change a three-letter identifier was for safety considerations.

CNN: Sioux City SUX, and that's OK

The head of Freeport's Indonesia unit, Rozik Soetjipto, says it is a temporary suspension out of sympathy for the victims but also due to some safety considerations around underground operations.

BBC: Freeport's Grasberg copper mine

While designing the sequences, Villareal had to address practical issues like safety for passing boats and drivers on the bridge, as well as artistic considerations such as making sure the animations were viewable from up close, below the bridge, and as far away as Twin Peaks, where the bridge can been seen on fog-free nights.

CNN: San Francisco turns a bridge into art with 25,000 lights

Safety considerations will be taken care of by having chains of approved dealers who meet manufacturers' technical standards for repair and maintenance work.

ECONOMIST: Car industry