PARK LANE (n.) Bridleway that doth in places exceed four carriages wide with a wide central island, which for procurement of monies hath 20mph limit for one’s horses.
Dr. Johnson’s London Dictionary for publick consumption in the twenty-first century avail yourself on Twitter @JohnsonsLondon
CabbieBlog 
They are lucky to be able to do even 20mph on Park Lane. I only ever exceeded that when using a motorbike to commute to work.
Cheers, Pete.
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Apparently push bikes now get flashed as they are going faster than cars!!
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