Sometimes you can hear something before you can see it. You can hear in all directions but only see so wide. A backup beeper is a safety feature purposely ins

Sometimes you can hear something before you can see it. You can hear in all directions but only see so wide. A backup beeper is a safety feature purposely installed on trucks because it helps to hear that the truck is backing up before it runs into you. That said, I still look both ways before I step out into the street.