Stopping distances calculator
Most people have no idea how much longer it takes to stop at 30mph (48kph) and higher compared with at 20mph (32kph) or under. This tool can be used on your own or in groups of drivers and young people through an internet-connected whiteboard to help explain through the physics of speed the dangers of travelling above 20mph in built up areas.
Another way to demonstrate it is to discuss the below chart, which shows the effect of impact speeds through the comparison of a child falling out of a building. Download the physics of speed chart as a PDF.