Terrible accident in Rome.
2 police patrol cars engaged in different crime operations, both driving at full speed and with their sirens blaring, crashed at an intersection.

Probably each driver just heard their own siren but not the other's.

So, 2 overlapping concurrent alerts summed up to none.🤔

(It seems there could be a more general law to explain above event, but I'm not very sure what it is)

#modulararithmetic #warnings #selfalert