You don’t remove the roadways, you reallocate the space to prioritize active transportation (walking and rolling) over passive transportation (cars and trucks). Since cars and trucks are now competing for less space you again prioritize cargo vehicles over personal vehicles. The specific balance of active/passive transportation is going to be sensitive to context, of course- an industrial park will need to have roadways with enough capacity for trucks to move their goods, but a residential neighborhood doesn’t need to be bisected by a seven-lane expressway. The ultimate “carless city” is one where a vanishingly small percentage of personal trips happen inside car, even though it’s still technically possible and in some cases necessary. Service and cargo vehicles then won’t have to compete for space with suburban commuters and so the space actually allocated for cars can be quite small.
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