"We've made cars invisible now, but if you use an app on your phone you can see them coming from miles away on a map. We've not told the public yet, but they'll figure it out. It's so much safer, it's literally on their phones."<br>If I could figure out that sss sss sss sss means "reversing" I'd already be looking at the truck. And it's not like everything beeps, but I've heard every bus and every truck let out a sss when it stops or something... the opposite of reversing.