SEATTLE - It's pretty amazing how different 200 commuters can look depending on their mode of transportation.

If they all took light rail they'd take up roughly half of one lane, but it's a much different story if the same people are spread out in roughly 175 cars, filling nearly two city blocks and the air with emissions.

It's a point the Seattle Department of Transportation is eager to make.

"The city is very concerned about global warming and about what we can do to help. And the single biggest issue in global warming is the effect that transportation has on the environment," said Grace Crunican of the SDOT.

More than 200 people volunteered for a photo shoot that illustrates the impact on the roads, depending whether commuters choose cars, buses, light rail, or bicycles as their mode of transportation.

"By doing this project in Seattle we hope to set a real good example for other cities around the U.S.," said David Norris of OnRequest Images.

The volunteers in front of the camera were equally enthusiastic.

"The I-5 corridor was a learning experience that we can adapt as human beings if we want to. So this is part of that process and I go yes," said Rick Hodges.

For some, like Lucy Sloman and her daughter Natalie, the shoot became a family outing, with a mixed reaction to the long hours.

"I'm really committed to pedestrian oriented communities, and we like to do interesting things in the city' said Sloman, who is an urban planner.

"I was really cold and bored," said Natalie.

The images will be part of a commuter toolkit that will likely be before the public by the end of September. You should be able to find them on things like city and transit Web sites, possibly billboards, maybe even the sides of buses.

The production team that's producing the images, OnRequest images, donated their work for this project.

Some of the others involved in the project include King County Metro, the City of Seattle, and Sound Transit.