Today the 60th Maine Transportation Conference was held in Augusta. Hundreds of people attended to find out the latest on policy and technical issues that surround the transportation industry in the state. More than fifty exhibitors representing transportation organizations, safety and advocacy groups, design consultants, and product distributors were on hand.DOT commissioners from the past and present talked about the upcoming challenges. Funding is a big one. Former Commissioner John Melrose says the state must start thinking about other ways to generate revenue for transportation issues.Melrose suggests a gas tax be implemented that is not based on per gallon but rather per mile traveled.