What is the correlation between collision speed (of cars) and pedestrian fatality rate? https://perma.cc/Y4J9-U5Q7 Speed limits are an important regulation that can help reduce the kinetic energy and consequential injury severity in a crash. It is important for policy makers to prescribe speeds that are safe, i.e. survivable, for all road users. For pedestrians, it is not possible to fully eliminate the risk of a fatality. However, our results suggest an impact speed of 30 km/h has on average a risk of a fatality of around 5%. The risk increases to 13% for an impact speed of 40km/h and 29% at 50 km/h. Speed limits should be set lower in areas of poor visibility and thus slower reaction times. Furthermore, such speed limits could be supported by appropriate speed calming approaches such as physical measures (e.g., roadway design, pedestrian islands, and speed humps), surface treatments (e.g., road markings, rumble strips, and perceptual countermeasures), and traffic enforcement (e.g., speed cameras) to motivate drivers lowering their traveling speeds. Such speed limits and speed calming approaches are already commonly used by best practice countries that have the lowest road fatality rates and that practice a Safe System Approach to road safety (from The relationship between impact speed and the probability of pedestrian fatality during a vehicle-pedestrian crash: A systematic review and meta- analysis) Walking is about 16 times more dangerous than car travel https://perma.cc/337E-SN3P None of the European cities that lowered the speed limit to 30 km/h regrets it https://perma.cc/5HDG-HYHQ What forces can be tolerated the human body? https://perma.cc/GBQ6-TRFZ Studies show that pedestrians have a 90% chance of surviving a car crash at 30km/h or below, but less than a 50% chance of surviving an impact at 45 km/h. Research shows that the probability of a pedestrian being killed rises by a factor of 8 as the impact speed of the car rises from 30km/h to 50km/h.