The Cycling Minister said today he saw both very good and very bad infrastructure on a ride around the capital but denied he felt in danger at any time.
Robert Goodwill spent an hour cycling around London, from Kings Cross to Westminster via Camden, Southwark and Lambeth.
But Mr Goodwill criticised confusing road markings and bike lanes in Southwark, after venturing south of the Thames on his Brompton folding bicycle, joined by Department for Transport aides.
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The plaque at number 16 Cowley Street in Westminster marks the brown brick Georgian townhouse where Sir John lived for 31 years.
A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.