In what may be a first-of-kind study, researchers at the Virginia Tech Transportation Institute have concluded text messaging is just about the most deadly thing you can do behind the wheel of a car. However, talking on a cellphone isn’t that big a deal, the research suggests. Virginia Tech’s study, which is based on an analysis of 6 million miles driven under electronic observation, reports the risk of at least coming close to crashing balloons by 2,300 percent when drivers start tapping out text messages.