Only in South America;
Difficult to describe so bear with me;
Large road, 2 lanes each way, paved central reservation with no barriers. About a 60mph limit. (Americo Vespucio, Santiago with Echinique if you wish to look it up)
Strung across the road are cables, a bit higher than you'd see telegraph poles in the Uk. Perhaps 25% more.
Man walks onto central reservation, leans wooden ladder against cables and climbs up.
Man walks into the road, stops on the white line between lanes 1 & 2, leans ladder against wires and climbs up. (traffic still running at full speed).
Man walks onto path, leans 3rd ladder against cables and climbs up.
These three guys have no other support, and the ladders are simply leaning against the wires.
Man 3 (pavement) is passed a long cable by man on ground. Holding this he threads it through a loop holding all the cables together. Then, hand over hand, he pulls his ladder sideways until its leaning at almost 45 degrees towards man 2 (in between lane 1 & 2).
At the same time man 2 leans towards him. They meet in the middle and hand over the cable.
Man 2 pulls himself, hand over hand, upright and threads cable through a loop by him. And then continues to go further over until he is leaning towards man 1 (central reservation) who is leaning towards him. They pass the cable across and the central reservation man pulls himself and his ladder upright.
The other two men grab their ladders, distribute themselves on the other carriageway and repeat to get the cable to the other side.
All of this with rush hour traffic doing 50 odd mph.
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Implementing new overhead cable. 
Implementing new overhead cable. 