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Since we're talking about the future you can't limit solving this to current parking solutions.
I am developing a project where older folk get taken out to friends, the shops and appointments in side by side cycles. We are speaking to a London council 9who will fund this pilot) about providing secure on street parking for these. 2 will fit in the space of one car parking bay. Cyclehoop who make the on street cycle sheds could design one that fits two of these cycles...
http://www.3rfitbike.com/