Take a photo of a flag.
Do you notice a flag in the front of the vehicle. Yes, they call it boggey-whip. Every "mini car" in Sorowako which will enter the mining area of PT Inco must put a flag. By using the flag, the big monster-truck may notice that there is something little in front of the monster. As you may see in the picture, the truck shown is the tiniest one. The big big monster is much much bigger. It is impossible for the driver to see something in from his cabin if there is no flag hanging in a high place.