An average of eight people die in distracted driving crashes every single day in the U.S. And every year, around 400,000 people are injured in crashes involving distracted drivers.

The number of distracted driving accidents has only increased as smartphones are now commonplace for most U.S. consumers. That’s despite countless warnings from safety advocates, legislators, and law enforcement officials that drivers should never use mobile devices behind the wheel.

The chances are good that on your next commute, you’ll be sharing the road with someone whose focus is not on driving. But how do you identify these drivers so you can avoid them?