Naw, it would be incredibly expensive to provide a system that would allow the feeds for traffic signals to be unaffected when a portion of a substation shuts down. You'd need a whole new set of lines just dedicated for the traffic signals. We're talking tens (hundreds?) of millions just for one quadrant of the city alone.
Even if they wanted to implement some kind of addressable system (sort of like DALI for lighting, or a fire alarm system), it would be far cheaper, as you'd only be sending signal wires along the existing power lines, but still. That would be signal wiring along every single power line in the city. The labour for a task like that would be staggering.
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