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==Explanation== | ==Explanation== | ||
| β | This parody of a road sign essentially reminds drivers of the reality of the situation they are now in and thereby implicitly refers to the dangers inherent to it. Because the ability to travel in a box on wheels at high speeds was not selected for in the evolution of human, if anything happens to said box on wheels, such as crashing into a wall, the humans inside may be badly injured, if not killed. | + | This parody of a road sign essentially reminds drivers of the reality of the situation they are now in and thereby implicitly refers to the dangers inherent to it. Because the ability to travel in a box on wheels at high speeds was not selected for in the evolution of human, if anything happens to said box on wheels, such as crashing into a wall, the humans inside may be badly injured, if not killed. If, however, they had evolved something like exoskeletons, for example, this may not have been the case. This reminder would presumably prompt drivers to drive more carefully or perhaps slow down. |
Humans did not evolve to have the ability to withstand such forces because their ancestors commonly never traveled any faster than about 20 km/h (top human speed on foot), although some individuals may have moved faster than that by falling out of a tree or off a cliff. Fast vehicles, on the other hand, have only appeared in the last couple of hundred years, and it would take many more tens or hundreds of thousands of years before these new selection pressures made any noticeable difference to human physiology, if any. | Humans did not evolve to have the ability to withstand such forces because their ancestors commonly never traveled any faster than about 20 km/h (top human speed on foot), although some individuals may have moved faster than that by falling out of a tree or off a cliff. Fast vehicles, on the other hand, have only appeared in the last couple of hundred years, and it would take many more tens or hundreds of thousands of years before these new selection pressures made any noticeable difference to human physiology, if any. | ||
