[14] Road safety is best ensured by a complete prohibition on having a cell phone in one’s hand at all while driving. A complete prohibition also best focuses a driver’s undivided attention on driving. It eliminates any risk of the driver being distracted by the information on the cell phone. It removes any temptation to use the cell phone while driving. And it prevents any possibility of the cell phone physically interfering with the driver’s ability to drive. In short, it removes the various ways that road safety and driver attention can be harmed if a driver has a cell phone in his or her hand while driving.