How one can express emotions not using foul language and indecent gestures. It’s turned out that it is rather simple. Actually you can make such as called auto smile which helps to express your attitude to the man making way for you or to real boor. By the way you can make such a device and it will be rather cheap.
A plastic round wall clock can serve as the basis. The pointer and mechanism are taken off and head smile and eyes are made from 12 volt wires. Net scroll is used as control penal. The wire is pulled from the clock to the net scroll. The clock is held out on the rear window. The wire from the net scroll is pulled to the cigar lighter. Electric battery can be used instead of cigar lighter. And that is all. This mechanism will cost about twenty dollars and it will be a little trouble with soldering iron.