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. Therefore, 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.
The replacement of the original traffic warning signs is a huge and complicated project, which requires huge cost is the best indicator that the researchers' recommendations are not meeting their goals.