Louisville transportation activist Jackie Green says he'll be a candidate for mayor in next year's election.Green is the former executive director of the Coalition for the Advancement of Regional Transportation, or CART, and operates a bicycle courier business.He says he'll run as an independent candidate."We're setting up staff right now. Our fundraising plans are on hold. We've been offered money. I've said thank you to those who have offered money but we're not ready to spend money in any significant way," Green said Tuesday.Green says transportation will be the main plank in his campaign platform, particularly the need for improvements in the city's public transit system.Six Democrats, two Republicans and one other independent candidate have announced they'll seek the mayor's office in 2010.Incumbent Democrat Jerry Abramson won't seek a final term in order to run for Lt. Governor in 2011.