Train horns serve as safety signals, using specific patterns to communicate with staff and pedestrians. Know why trains honk ...

"Compressed air horns may produce a sound at 100 dB or higher," the letter reads. "When an individual is exposed to long, repeated or close-proximity exposure to decibels higher than 70 dB ...

When it comes to making yourself heard over the crowd, the classic way to do it is with a handheld air horn. Nothing says, ...