describe it. long. in fact, two hours long each way. well, actually when we got in the car with her, she had a few other choice words. absolute agony. white-knuckled fury. reporter: at some point, every commuter stares straight into the brake lights ahead and thinks it. this is going to kill me. turns out it just might. in the study, researchers looked at 4,000 frustrated drivers smack in the middle of one of the worst commutes in the country, dallas, texas. they found those commuting ten miles or more had bigger waistlines and higher blood pressure than those with shorter commutes, even if they exercised regularly. it s the first study that has documented how commuting distance affects objective health outcomes. so, namely, blood pressure, cardio respiratory fitness and weight. reporter: but the reality is, america needs to get to work. the average commute is about 25 minutes long each way.