You have seen the zombie-like creatures walking among us. In fact, you may be one of them, moseying along with your eyes fixated on that tiny screen that rests in the palm of your hand.

Americans overwhelmingly think this is okay. It’s not.

“It’s just really dangerous,” said Deborah Hersman, who heads the National Safety Council and is a former chairman of the National Transportation Safety Board. “Everybody walking down the sidewalk either has their headphones on or is looking down at their phone. It’s a sad commentary on our society when you look at how distracted people are.”

By now, everyone knows that talking or texting while driving can get you killed. But the fact that 3,154 people died and an estimated 424,000 were hurt in 2013 is evidence that a great many people are willing to ignore the advice to keep their attention on the road.

News that you could get hurt or even die while walking around – made oblivious to your surroundings by your cellphone obsession – isn’t very like to be more persuasive. But there is plenty of anecdotal evidence and an emerging body of research to back up those warnings.

“Some data suggests that at any given moment on the streets of America, 60 percent of pedestrians are distracted while walking, meaning either on the phone or doing something on their phone,” said Alan S. Hilibrand of the American Academy of Orthopaedic Surgeons. “It’s a bit of a startling number.”

Hilibrand, vice chairman of orthopaedic surgery at Thomas Jefferson University Hospital in Philadelphia, has seen evidence of what he calls “digital deadwalkers” on center-city streets.

“We’ve had people come into the emergency room who were hit by cars,” he said. “They’re looking at their phone and not paying attention to the fact that a vehicle is making a turn.”

In a bizarre tragedy a few blocks from Hilibrand’s hospital in May, a 68-year-old woman visiting from Texas was looking down at her iPad as she crossed a street in the city’s Chinatown. She was hit by an amphibious duck boat filled with tourists and died of head injuries.

As mobile devices have become more ubiquitous, the number of emergency room visits by distracted walkers has climbed steadily. Some of the best information is a bit out of date, but it gives a sense of the trend. In 2005, 256 pedestrians who were injured while using phones received hospital treatment, a number that grew sixfold by 2010.

“I would say the really rapid explosion and proliferation of these devices has taken off in the last five years, so I suspect the numbers have jumped quite a bit,” said Hersman, whose National Safety Council compiled the data.