Minsk Driver's Dump Truck Mystery: What Causes This Odd Texture?

A Belarusian man driving in Minsk noticed an unusual textured surface on the back of a dump truck. He filmed the truck and posed the question online, sparking a small discussion about the origin of the texture. "I saw this strange texture on the dump truck and wondered if it's a factory defect or if it develops over time," he said in his video. While the question remains unanswered, the video highlights the curiosity of everyday observations.