Hila Traffic Light
This model traffic light uses aluminum strips
as switches. Press a switch and a light comes on.
Instructions for constructing this traffic light.
My traffic light doesn't work!
1: If only one light is not working, press hard
on
the tacks holding the wires and aluminum strips.
One may have come loose.
2: If none of the lights work, try a new battery.
3: If the new battery doesn't fix the problem,
press all of the connections on the "-" side
of the LEDs including the resistor.