Visuals

Cone of Vision at different speeds. Credit: Claudio Olivares Medina
In Munich and many other German cities 80% of streets have 30km/h limits. The Pareto principle (80/20 rule) can explain why it is widely accepted by drivers to share these streets as they are not important for their travel time.

German 6 year old child walking to school on a 30km/h street (2020, Bad Toelz). Safe walking infrastructure does not always carry a high price tag: The majority of road safety experts we surveyed said a 30km/h environment as above is safer for children walking to school than a typical Australian neighbourhood with a footpath on one side of the road, no crossings and a 50km/h speed limit.

Typical 30km/h zone in neighbourhood in Germany. There are no cycle lanes in these areas as experience showed that a shared low traffic, low speed environment is safer for people riding a bike. There are no speed humps or chicanes to slow traffic down. Rather than “tricking” drivers into slowing down, driving too fast here is socially not acceptable and enforced by the councils.
A local campaign is using this image to campaign for safe-street-to-school. They are asking to separate their children from fast moving traffic by proving footpaths and crossing or 30km/h limits on the way to school.

The above graph is published by the German Automobile club. This data is for a good driver with quite a fast reaction time of 1 second and assuming good road conditions. Note that “thinking distance” is not dependent on how good your brakes are. If you drive 30km/h and someone would step out on the road 15m in front of you, you would just stop in time. If you drove 50km/h you would hit the person with an impact speed of 50km/h.
The kinetic energy is proportional to the square of the impact speed. Find out more about why “speed kills” is not just a marketing slogan but based on physics (the second law of motion). Best practice is setting speed limits according to the amount of biomechanical energy humans can tolerate without sustaining permanent injury.
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