As the tempo increased,Brodsky found drivers ran more risks, such as jumping red lights, and had more accidents. When listening to up-tempo peieces, they were twice as likely to jump a red light as those who were not listening to music. And drivers had more than twice as many accidents when they were listened to slow or medium-paced numbers. Brodsky concedes that behavior on a simulator may not translate into the same behavior on the road. "But I think it's got to be taken seriously, " he says