Opponents are challenging the ballot wording of a proposed sales tax increase for transportation projects. A lawsuit filed Thursday by the Missouri Association for Social Welfare contends the wording needs to be rewritten for the august ballot as it is misleading and unfair. Supporters say the lawsuit is a long shot attempt to make the wording more confusing. The proposed tax increase would impose a three- quarter-cent sales tax for roads, bridges and other transportation projects at the lake of the Ozarks and across the state. Supporters say it would generate $534 million dollars annually over the next ten years. Voters will decide the measure’s fate in august.