A sign post clearly marks two cycle paths in London, Thursday, May 24, 2012. There are many cycle paths across London that can be used to travel the capital. Like a runner or a swimmer, you would need to be physically fit. Like a goalie or a boxer, you should be prepared for close calls. But if you are coming to London's Summer Olympics _ and you have what it takes _ using a bicycle could be a great option in a city bracing for gridlock. (AP Photo/Kirsty Wigglesworth)