The Maine Turnpike Authority projects that if nothing is done, growing traffic on the stretch of Interstate 95 between Scarborough and Falmouth will create serious peak-hour traffic problems at some exits within seven years. Staff file photo by Joel Page Some transportation and environmental advocates are urging the Maine Turnpike Authority to pump the brakes on apparent plans to widen a stretch of heavily traveled highway around Portland. The authority appears prepared to add two travel lanes on up to 11 miles of the four-lane highway, but some want the agency to consider all other alternatives before committing to the multimillion-dollar project. Other critics point to academic research that shows building more highways doesn’t alleviate traffic – it creates more. “We have a duty to consider all the options on the table and not have a preconceived conclusion,” said Kristina Egan, executive director of the Greater Portland Council of Governments, a regional planning group.