The #1 driving distraction is using a cell phone while driving. According to the NHTSA, sending or reading messages on your cellphone is the most dangerous distracted driving habit on the roads today. Using cell phones while behind the wheel is illegal in many countries and can greatly increase the risk of accidents on the road. If you must use your phone, always make sure you have a hands-free device or pull over to the side of the road before looking at your device.