Our streetlights are generally 120 volts. Most branch circuits are fed with #6 and O/C at around 20 amps.
Completely urban.
Hyway lighting is usually higher voltage to address VD and can be 600V or 347V. We don't see much 480/277 in Canada except in motors and industrial sites that have US owners.
I can't speak for Southern Ontario where the cars are made but I would be surprised to learn the Canadian GM plant used 600 volts when the Detroit GM plant used 480.
