What is this, a traffic light for ants?? Yes! No, we jest again, the scaling would be completely off. Here's an adorably Lilliputian Mini Traffic Light, perfect for miniature sets, dioramas, dollhouses, mini-verses, what have you! 

Simply power up with 3V-6V the LEDs are common anode. Connect positive to the black wire (anode) and negative to either of the red, yellow, and green wires to light up their respective LEDs.