Critics, studies cast doubt on Maine’s claims of climate benefits from highway expansion

Climate and clean transportation advocates are calling into question a claim by Maine officials that a new toll road proposed outside Portland will reduce carbon emissions by alleviating gridlock. It’s a common argument made in favor of highway expansions nationwide, said Benito Pérez, a former transportation planner and engineer. But it relies on a narrow view of data that, in context, tends to show these projects are more likely to increase planet-warming emissions, he said. “This is a multi-dimensional issue when it comes to emissions reduction, and it’s not going to work.” Maine’s proposed Gorham Connector project has met stiff public opposition.