Ive seen one or two people do that before...I don't see how it is a benefit. All it does is distract you from driving.....

Here is another question, since in Maryland (and I assume other states in the USA) require your headlights to be on when your wipers are, why not make the vehicle automatically turn the headlights on when the wipers are set to on?

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"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.