A nordic capital, 1mil population, old-style city centre. <a href="https:&#x2F;&#x2F;commons.wikimedia.org&#x2F;wiki&#x2F;File:Stadsplanesystem.jpg" rel="nofollow">https:&#x2F;&#x2F;commons.wikimedia.org&#x2F;wiki&#x2F;File:Stadsplanesystem.jpg</a> (1st picture). 15 minutes walk to central railway station connecting (kind of) to the rest of the world.<p>I&#x27;d say the independent&#x2F;free play-area radius extends beyond the inside yard sometime between 4 and 5, by 10 kids would be cycling all over the city by themselves. Most would walk 10-15 mins to their kindergardens themselves (?) from about the age of 5.<p>I wouldn&#x27;t consider this an outlier, and my family wasn&#x27;t particularly laissez-faire. Many friends would go cycle-touring or interrailing in Europe between 15 and 20. Doing a solo interrail in Europe for a month is a culturally established &quot;rite-of-passage&quot;, although people will usually wait till they turn 18 to go alone.