The bill establishes an emergency law aimed at financing long-term improvements to the commonwealth's transportation system, specifically targeting municipal roads and bridges. It allocates a total of $1.385 billion for various transportation projects, including $300 million for the construction and reconstruction of municipal ways, $500 million for bridge and pavement lifecycle asset management, $200 million for culvert and small bridge modernization, and $185 million for transportation capital projects to alleviate congestion and improve safety. The Massachusetts Department of Transportation is tasked with overseeing the disbursement of these funds, which are in addition to any previously appropriated amounts.

To finance these expenditures, the state treasurer is authorized to issue bonds not exceeding $1.185 billion, with a maximum term of 30 years, payable from the General Fund or the Commonwealth Transportation Fund. The bonds will be designated as the Commonwealth Transportation Improvement Act of 2025. The bill also allows for the issuance of special obligation bonds, which will not count against the commonwealth's outstanding bond limits. This comprehensive approach aims to enhance the infrastructure and safety of the transportation system while ensuring that municipalities can effectively utilize the allocated funds.