I expect you'll find both arrangements in both countries - they are at different stages in the power distribution system.
In the top photo, wires 1, 2, and 3 are three-phase high voltage (13.2 kV in my area) The single wire running at right angles to 1, 2, 3 is a single HV phase to supply local step-down transformers to deliver 120/240 V to homes. Wire 4 is Ground/Neutral - it should be connected to ground posts frequently.
In the lower photo, wire 1 is High Voltage (like the unlabeled wire in the top photo). Wire 2 is Ground/Neutral and wires 3 and 4 are the two 120 V "hot" wires (240 V between them). If you follow wire 1 to other poles, you'll probably find step-down transformers on every third or fourth pole, with the transformers feeding 120/240 V to wires 3 and 4. Wires 3 and 4 will be broken with insulators between transformers.
Added photo taken in my Canadian lane:
On the farther pole, you can see the 3 phase HV lines at the top of the pole. You may be able to see the connection from one of those lines to the HV line running to, and past, the top of the nearer pole.
On the nearer pole, there is a connection through a fuse to the top connection on the transformer (big grey can). The secondary terminals of the transformer connect to the lower group of three wires marked "120/240 V". Cables go from those three wires to the individual homes.
The thick bundle of cables lower on the pole, and the many small wires from them are for telephone and cable TV. The boxes on hte pole just below those wires are a micro cell phone repeater.