Tom: <i>It's safer</i><br>Me: Umm... it sounded like pressurized air releasing, which is quite common on job sites even beyond the air brakes on vehicles. <br>I refuse to believe this is actually safer. I'd love to see real-world statistics backing that up. Everyone knows when they hear that distinctive "beep beep beep" to immediately look around and make sure they're not about to be ran over. If I heard this, I would think nothing of it. It's a very ambiguous sound, unlike the distinctive beep-beep-beep we're all used to. This was done to appease apartment dwellers, not to improve safety.,(reply>), If that's the case they should get rid of them all together and just let people get run over it'll be far safer without Darwin awards. Practical example was I was walking downtown in my little middle of nowhere town and I was able to spot a vehicle using the system. It also doesn't need to be that strong just within vehicles vicinity. But I would love to see the data as well. Of course there's the opposite problem some of those beeping alarms actually causing hearing damage on construction sites and requiring OSHA to mandate hearing protection two wrongs make a wrong right?