American motorists spend substantial amounts of their day in automobiles, vans, trucks, and buses.
It is not surprising that people will attempt to optimize their time in the vehicle by using phone and computers. While the true extent of such usage is unknown, anecdotal information suggests that it is more common than might be expected, given the potential safety implications. Whenever you're driving a vehicle and your attention is not on the road, you're putting yourself, your passengers, other vehicles, and pedestrians in danger. Stressful or heated conversations, especially those involving relationships, contribute to driver distraction. When combined with a cell-phone call, the combination can be deadly.