I don’t know about you, but I try to be respectful of other drivers. Even nice. A wave of the hand now and then is just a nice gesture. Then there are those times when flipping some idiot the bird is totally appropriate too. It might be nice to have a hand that will do all the talking for you, so you can concentrate on the driving.
“The Hand” sign for the back of your vehicle can be used to tell someone that “they rock” or flip them off, even give them a peace sign, plus a few others. I would say just use it liberally for both good and evil. Have fun. Just make sure you actually look first as a police officer won’t take kindly to your new toy. The 9″x6″ remote controlled sign will cost about $40.