IL HB2629

Requires the Illinois EPA to establish greenhouse gas (GHG) emission targets for the transportation sector by January 1, 2027, with goals of reducing emissions 50% below 2005 levels by 2031 and 80% by 2050

Mandates the Department of Transportation and Metropolitan Planning Organizations (MPOs) conduct GHG emissions analyses before including roadway capacity expansion projects in planning documents, accounting for induced demand effects on vehicle miles traveled

Requires calculation of a "climate equity accessibility score" for transportation projects costing $30 million or more, measuring impacts on GHG emissions, job accessibility, and transportation affordability

Establishes a social cost of carbon that must be used in transportation planning beginning September 30, 2026, requiring cost-benefit analyses to offset projected carbon costs against congestion relief benefits

Creates a Greenhouse Gas in Transportation Working Group to assist with implementation and requires triennial reports on statewide transportation GHG reduction progress beginning January 1, 2029