Targeted Car Horn2

This system has two parts, the receiver /driver compartment horn and the aimable transmitter / horn trigger.

A diagram on the dashboard has 6 buttons representing cars around you. Push the button in the position that most approximates the car you hate and a signal is sent to their receiver giving them a horn blast in the driver's compartment that doesn't bother the cars around it.

You'd probably have to have a button representing the car behind you so you can give the guy who honked at you a return honk.

Alternatively, you could have an array of cameras on the dashboard sense the direction your finger is pointing and the position of your thumb. When you point at a particular car and drop your thumb in a mocK gun shooting gesture, a honk signal is sent to that car.

Why would people leave their receivers on to be subjected to a horn going off in your car at the whim of some jerk? Because the system is wired such that it's either all on or all off. You can't just sent targeted honks at people without being able to receive targeted honks as well.