Making Chicago bicyclist-friendly is just one of the ways city officials are trying to make Chicago the greenest city in the world.

Although CTA and Metra don't allow people to take their bikes on the train during rush hour, CTA buses have exterior racks that are equipped to handle bikes.

With the bike riding outside, other passengers don't have to be bumped by  pedals or poked by handlebars.

Erik Costlow of Chicago’s North Center neighborhood said he takes his bike on the bus frequently. He finds it quick and easy, and drivers and passengers are generally patient and good-natured about the time it takes to load it onto the rack and remove it.

But not everyone shares his views.

Jeffrey Allen, who lives in Chicago’s Lake View neighborhood, said he would not take his bike on the bus. It's an expensive bike, he said, and he doesn't want anything to happen to it. Also, he said people can be killed when they are taking their bikes off of the bus rack.

The CTA said one person has been killed in the past six months while using the bike racks.

On Dec. 31, a 59-year-old woman was run over by a bus on the North Side while trying to take her bike off the rack. She was dragged 80 feet before the driver realized what was happening.

Costlow said it is important that people make sure the driver is aware they are using a rack before they move in front of a bus.