Life on two wheels: Cycling in the world's cities
While cycling has never lost its appeal as a form of transport in many countries, in others - such as the UK - it is enjoying a revival. In a special series, BBC News asked people around the globe to tell them what life on two wheels is like in their part of the world.
Tulip Mazumdar avoids the packed London Underground and buses at rush hour and takes a ride on one of London's "Boris" bikes.
Amsterdam and Delhi
In Amsterdam Dr Suzanna Adema safely takes her children everywhere on her bike, but Billiam Lal tells us how dangerous the roads are in Delhi.
Rio de Janeiro and Nairobi
Brazilian men's volleyball coach Bernado Rezende talks about breaking bones in Rio, and Joshua Agisa delivers packages in Nairobi.
Beijing and Cairo
Hon Rui explains what cycling is like in rapidly changing Beijing, while Walaa Elhawary shares her experiences of cycling as a female in Cairo.