Stop Highway Expansion

 NEW: For over 4 years the Maryland Sierra Club has raised concerns about the flaws of the I-495 and I-270 project. The toll lanes project won’t be approved by the Governor Hogan administration! This creates an opportunity to consider better transportation solutions. We look forward to working with the Moore administration and the new Board of Public Works to create effective, equitable transportation solutions that help all Marylanders and our climate.

Highway expansion

Take Action   Volunteer   Statements   In the News   Testimony

The threat of new, substantial highway expansion is real. Governor Hogan is actively promoting an up to $11 billion plan to widen the Capital Beltway and I-270 with 4 new toll lanes each that, combined, would stretch hundreds of miles long. The proposal calls for the private toll lanes to be financed by what would be the largest highway public-private partnership (P3) in North America.

Research on past highway expansion projects, including the previous expansion of I-270 in 1990, consistently demonstrate that widening lanes does not solve congestion. Instead, it encourages more people to drive, increasing traffic, while the congestion problem returns a few years later. Highway building results in bringing more fossil fuel emitting vehicles to the road that exacerbate climate, air, and water pollution while perpetuating sprawl that deteriorates our natural places and reducing spaces for walking and biking.

We are working to scrap this project and replace it with a new vision for equitable, and sustainable transportation. See our vision here.

Take Action

Donate to our MD Smart Growth Defense Fund to halt the I-495 and I-270 highway widening toll lane project!

Learn more about the harmful I-495 & I-270 P3 expansion project by reading the 50+ group and City of Rockville SDEIS comments! The comments were submitted Nov. 30, 2021. Share this information with others!

Interested in volunteering? Send an email to Lindsey at 

Position Statements & Comments

Section 106 Comments on Historic Places and Environmental Justice Issues (2022)

Supplementary Draft EIS (2021): Over 50 Groups and City Deliver a Sharp Legal Critique Challenging Gov. Hogan’s I-495 and I-270 Toll Lane Plan

Draft EIS (2020): Governor Hogan’s Toll Lane Plan Is Harmful and Legally Vulnerable 50 Groups Submit Over 200 Pages of Technical Analysis

Written Testimony on the Phase 1 P3 Agreement, I-495 & I-270 Relief Plan

Statement on MDOT's New Recommended Alternative for I-495/I-270 Toll Lane Widening

MD Sierra and Descendant Statements in Support of African American Cemetery Bill

It's Time for Franchot, the BPW, and MDOT to Keep Their Promises

Click here for full list


See our testimony on highway legislation and other transportation legislation in the 2021 General Assembly here.

Sierra Club in the News

Comment Period Extended After Enviro Group Flags Errors on Highway Project

Md. Sierra Club: Will the Senate Co-Own Hogan’s Highway Boondoggle?

Possible legal challenges pose cost risks for Maryland toll lanes proposal

Maryland selects Transurban, Macquarie to develop toll lanes for Beltway, I-270

Maryland Sierra Club is also a proud member of the MAST Coalition that is working to oppose the highway plan.  Read the MAST Open Letter to Comptroller Franchot about Toll Lane Expansion.

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