Read that in an entertaining piece (6 years old) by Malcolm Fraser
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the positives of what Leon Krier calls “the city of short distances” – shops, transport etc nearby – are usually paid only lip-service (or actively attacked – witness the closure of Post Offices), for the real agenda is “what a city looks like”, not how we live in it.
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Also
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Trips in ‘cities of short distances’ (100–200 people per hectare, mixed land-use and walking times of around 30 minutes to everyday destinations) can be switched to non-motorised modes. Such cities (or regional centres in polycentric cities) are typically 5 km in diameter. Modal shift is more likely to occur where well-designed and attractive infrastructure is provided for pedestrians and cyclists.
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More examples -
https://www.google.co.uk/search?q="cities+of+short+distances"