I used to think that making your bed every morning was silly. But then someone said to me that it might be the only thing you achieve that day, so now I always make my bed.
As Rishi says, 30mph is a good British speed in that it embodies the good old fashioned British sense of fair play and healthy competition. Maybe the car will come out on top or maybe the cycling child will. At 20mph the child will usually live, which seems unfair on the car. π¬π§