MARBLE ARCH (n.) White edifice, once lokated outside a royal residence, whose function is unclear except to prohibit ingress by the publik, whilst only permitting regal throughfare
Dr. Johnson’s London Dictionary for publick consumption in the twenty-first century avail yourself on Twitter @JohnsonsLondon
CabbieBlog 
And to create more traffic bottlenecks of course… 🙂
Cheers, Pete.
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It’s bizarre that only the Royal Family can travel beneath the arch. Thanks for the comment.
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