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The M25. All cars banned within and streets pedestrianised.
It doesn't take more than 7 hours to walk to central London from anywhere within the M25, and it's never more than a 45 mile round trip. No one needs more than 2 hours sleep after an 8 hour working day so it should be doable.
I suppose lucky people could get trains for part of the journey, but with all streets being pedestrianised there won't be any buses, so there simply won't be enough rail capacity for most people.