This is a STOP sign which lights up when you apply the BRAKE of your motor vehicle.
It is suitable for Cars, Scooters, and Motor Cycles.
I have made the Cirtuit Diagram for AC and DC type of vehicles.
You can buy one but making it is fun and cheap.
Step 1: STEP-1
As you can see here that this little device can be fitted to any vehicle having a BRAKE LIGHT working on a Contact ON spring switch.
The concept is not new but it is cheap when you make your own light, out of a kids pencil box.
Older VEHICLES work on "magneto" or AC Generators for which a AC circuit is required.
The modern VEHICLES work on a 12 volts Battery, for which a DC circuit is required.
Here I have shown the circuit diagram of both types of currents AC and DC.