Although completely surrounded by mountains the city of Bogota is mostly flat. Bike routes are distributed throughout the city. A high percentage of the public commute on motorbikes, scooters, and bicycles since there are restrictions on vehicles you are only allowed a certain number of days per week to drive your car to help control the pollution. Driving in traffic seems to be uncontrolled chaos but everyone seems to flow together. Because of the amount of traffic high speeds are kept to a minimum.
I saw quite a few single speeds and some fixed gears. Pretty incredible to see almost as many motorcycles and cyclist as cars on the road.