Eileen McAnneny, president of the Massachusetts Taxpayers Foundation, says express lanes are worth exploring but the state should also try to get people to ditch their cars altogether by adding tolls. "There are a lot of roads in Massachusetts that we don't toll that we could use that money to help invest in public transit to accelerate the improvements and the modernization so that we have public transit as a viable alternative,"says McAnneny, who was also vice chair of the governor's commission on the future of transportation.