Proposed Engineering Features. The Build Alternative would include the following features, as shown in Attachment B. • Addition of a new continuous access HOV/express lane in both the southbound and northbound directions of I-680 from SR 84 to Alcosta Boulevard; • Installation of electronic tolling equipment and signage; • Widening/reconstruction of pavement in the median and outside to accommodate the HOV/express lanes; • Widening or modification of bridge structures to accommodate freeway widening; and • New and replacement median concrete barriers, retaining walls and sound walls. For regional consistency, the HOV/express lanes will include a continuous access type, allowing vehicles to access HOV/express lanes from adjacent mixed-flow (general purpose) lane throughout the limits of the facility. During the hours of operation, drivers of SOVs can choose to use the HOV/express lanes for a fee. All eligible HOVs as authorized by the Federal and State statutes (including motorcycles, buses, and eligible clean air vehicles as authorized by the California Air Resources Board) would be able to access the HOV/express lane during the hours of operation. Depending on the operational business rules, these vehicles may travel fee-free or may incur a reduced fee. The Bay Area Managed Lanes Committee, composed of Caltrans, MTC, and California Highway Patrol (CHP) staff, will decide hours of operations of the HOV/express lanes. Outside of the hours of operation, the HOV/express lanes would be operated as general purpose lanes, open to all users for no toll. Complete Streets Program would not be applicable as this project includes addition of express lanes exclusive to I-680 and improvements to local streets are not proposed.
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Sources: Project Baseline Agreement, Project Baseline Agreement