Dozens of policy experts, elected officials, advocates and citizens are embarking on a three-day Michigan Transportation Odyssey that started Wednesday in Detroit, is snaking through West Michigan and concludes Friday in Traverse City. The group, led by the Transportation for Michigan (Trans4M) coalition, will use seven distinct brands of public transportation, cover roughly 350 miles and take 56 hours. Media, advocates and residents are invited to join all or part of the adventure.