$(1)$ Hands$-$free devices are important for safe driving, and $(2)$ you should wear them whenever you talk on your cellular phone while driving. $(3)$ Hands$-$free devices can help you maintain adequate control of your vehicle. This is because $(4)$ without a hands$-$free device it takes one hand to hold on to a cellular telephone while driving, and $(5)$ only one hand is then available for steering the vehicle. $(6)$ Keeping adequate control of your vehicle is essential to driving safely, and $(7)$ you should drive only when you can maintain adequate control of your vehicle.