Not all that sure. However I do know that it's pretty low on the list of things that are likely to kill me in the event of a car crash. If I want to optimize f

Not all that sure. However I do know that it's pretty low on the list of things that are likely to kill me in the event of a car crash. If I want to optimize for the minimization of my small yet non-negligible chance of dying in a car crash I'd gain a much larger effect by trading in my current car for a Volvo rather than removing my dash-mounted iPad. I'd get an even better effect by improving my driving habits; not listening to music while driving, never ever exceeding the speed limit and only driving when absolutely necessary. But sometimes we trade off safety for convenience.