CHAPEL HILL - The mayor and the biker stood shoulder to shoulder at Sunday's Carolina North traffic forum: the politician in a sportscoat, the cyclist in biker pants and shirtless as he cooled off from his ride down Homestead Road. It's a scene that may get repeated in future years as town and gown figure out how to move lots of people -- in cars, buses and bikes -- to and from the planned campus north of Estes Drive and west of Martin Luther King Jr. Boulevard. The citizens group Neighborhoods for Responsible Growth held the forum to share ideas before this week's release of a draft traffic impact analysis, showing how many trips the project Carolina North may add to local roads. At press time, the town was planning to post the document on its Web site Tuesday and present it to the community at 7 p.m. Thursday at The Chapel Hill Library