The I-84 Hartford viaduct replacement study has been described as the highest dollar value project currently in planning and design in the USA. The project covers a segment of I-84 that starts in downtown Hartford, Conn. and runs west for nearly four miles through densely populated urban areas on raised viaducts that were built in the mid-1960’s. The purpose of the I-84 Hartford Project is to address the highway’s structural deficiencies, improve traffic operations and safety, and improve mobility, all while maintaining access for the City of Hartford and adjacent communities. At the same time, the I-84 Hartford Project strives to reduce the highway’s adverse impact and footprint on the city, while integrating it more closely into the regional multimodal and interstate transportation system, both existing and planned. In addition, the redesign of the I-84 mainline takes into consideration the City of Hartford’s economic development and urban design goals, and intends to be consistent with the State of Connecticut’s goals of energy efficiency and responsible growth. The DOT envisioned a rebuilt I-84 that successfully does the following: •    Accommodates the traffic demand more safely and efficiently than existing highway •    Promotes greater mobility by facilitating connections with other modes •    Adheres to ‘Complete Streets’ practices that emphasize safety and accommodation of all users regardless of age or ability •    Provides additional economic development opportunities •    Facilitates goods movement into and through the corridor •    Minimizes the impact and barriers to the communities through which it passes •    Is implementable and embraced by many