48% of 18- to 29-year-olds use Net while driving The growth of smartphones is fueling the trend, with 43 percent of young motorists checking e-mail behind the wheel and 36 percent reading social media networks. More than 3,000 people were killed and 400,000 injured in 2010 in traffic accidents involving a distracted driver, Transportation Secretary Ray LaHood says. The shares fell 19 percent to $47.49 on Friday, their biggest decline in almost a year, after the retailer posted a bigger third-quarter loss and a 23rd consecutive quarter of declining sales.