I would never have guessed that sound was a truck backing up and I'd probably be killed. Thanks safety engineers.,(reply>), @Brian Hawkins "Trust the experts!" is how you end up dead.,(reply>), @Brian Hawkins You're not trusting "science," you're putting blind faith into egotistical busybodies who think they know better than common sense.,(reply>), No one in the world is responsible for more deaths than safety engineers.,(reply>), @morthim " the driver can see you, and you don't have to react"<br>That mindset is why cars have excessive electronics and such stupid looking designs these days.<br>Pay attention to your surroundings. It doesn't matter who's in the right when you're dead.,(reply>), @Brian Hawkins - Having worked commercial construction projects for 15 years, I can say that if I heard that sound I wouldn't EVER have thought that it meant anything dangerous going on.  That sound happens all the time on sites.