We've taken 30 calls since strike action began at noon and we're still urging Londoners to Take Extra Care http://t.co/aQPiRqXM1Y
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Google been delving deep into its own data, and has some intriguing answers.
The so-called cycle super highway from Westminster to the Tower of London is one of Johnson's flagship transport projects.
Sunday is expected to be the hottest day, with the mercury due to top 26C in London.