The studies of the Tappan Zee Bridge and the I-287 Corridor started with a long term analysis (April 2000). The 3.1 mile bridge was constructed in 1955 and does not meet current bridge and highway standards, such as lane width, shoulders and emergency lanes and engineering standards, such as seismic and security. The bridge has aged and is undergoing extensive repairs. In 1955 it carried 18,000 vehicles daily: today the average is 135,000. The 30 mile corridor runs from Suffern in Rockland to Port Chester in Westchester.
The mayors or town supervisors of the municipalities listed below have signed the U.S. Mayors' Climate Protection Agreement, thereby pledging to reduce greenhouse gas emissions in their communities to 7% below 1990 levels by 2012. The Agreement has also been signed by the County Executive of Rockland County.