Let’s face it — when we’re out on the road, we have to divide our attention to do many different things. We’re watching the cars ahead of us, planning backup routes to dodge traffic, singing along to the radio or our integrated iPods, keeping an eye on kids in the backseat and responding to phone calls. In response to the multifaceted lives we all live these days, many automakers have installed voice-recognition systems into their models to keep your eyes on the road. But a new study shows that those systems can harm more than they help. That is, with one notable exception: Toyota’s Entune system.