Quote:
Originally Posted by calgarygeologist
This is not correct. 30km/h is not some arbitrary number that was chosen but rather it actually reflects data collected and analyzed. From what I could find the risk of severe injury or fatality to a pedestrian at an impact speed of 30km/h is about 10% and it does not really change below 30km/h. At 50km/h the risk of severe injury or fatality becomes 75%.
In terms of safety, from an injury from impact perspective, there is little to no benefit in reducing the speed below 30km/h. There might be a benefit in terms of crash/impact avoidance though.
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It would also be prudent to mention stopping distance.
12m stopping distance (in ideal road conditions) is a huge difference from 23m stopping distance.