IIRC Back in the 90’s there was some experimentation with High voltage DC transmission lines. One of the problems was that they did not get hot enough to keep ice off them.
In this case the traffic lights should be an easy fix with a thermostat and a heating element.
“IIRC Back in the 90’s there was some experimentation with High voltage DC transmission lines. One of the problems was that they did not get hot enough to keep ice off them.”
The same amount of heat is generated in a wire with dc as with ac.