[TheThinkTank] London's strategies?

Hi Everyone, I recently saw this article- London is set to have more bicycles than cars coming into the city at rush hour in the next few years. They cut their car entry by half in 15 years! What strategies did they use? Anyone from there who could comment more or send more articles?

http://www.bbc.com/news/uk-england-london-35475318

-Ariel