This is an inductive switch. There is a induction detector loop behind us, you can see the lead wire clamped to the top of the ground wire at the top of the picture. The induction coil on the right pole sets the switch according to the turn signals. The cone in the straight wire indicates that the power is off and we shouldn't go there. The last type of switch is not illustrated, there are contacts on the wires that detect the position of the bus (by the offset of the poles relative to the straight wire) and set the switch accordingly.
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