A few milliseconds of reaction time is critical when a speeding car needs to brake immediately. Sometimes, just a few meters away is the key to life and death. Recently, researchers used a simulated driving system and eye tracking technology to test the speed at which five groups of subjects responded to moving traffic signs. It was found that moving traffic signs did make subjects react more quickly. 
they suggested that the relevant departments should replace all the original traffic warning signs with more dynamic signs in order to improve the reaction speed of drivers.
If the person in the picture seems to be running, it is easy to associate the image of pedestrians rushing past your car.