The guardrail along the road up the side of Black Ridge in Kangerlussuaq is made from old metal oil drums filled with gravel to weigh then down and painted in bright colors, with holes punched in the sides and a cable strung through to connect them. Three photos here show a close-up, a single barrel, and the view uphill as a yellow airport police vehicle comes down.

Close up of one of the barrels
Close up of one of the barrels
Peeling paint reveals that this was originally a Texaco oil drum
Peeling paint reveals that this was originally a Texaco oil drum