Eyal Li, Union of Concerned Scientists
It’s well known to sustainable transportation advocates that our transportation sector is the largest source of carbon emissions in the United States — and cars and small trucks account for the largest share of this pollution. Still, people frustrated with congestion on their commutes often clamor for building more and bigger highways. The reality is that these projects usually increase emissions without making getting around any easier, yet elected officials keep forging ahead with them.
Gov. Larry Hogan’s proposed managed lane expansions to I-495 and I-270 is a textbook example. The stated purpose of this project is to reduce congestion. But studies show that highway expansions don’t really relieve traffic — they can…