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4.0 Geometric and Safety Design

4.5.1 State-of-the-Practice

The vast majority of tollbooths and toll collection equipment are installed on toll islands constructed of concrete that rise above the toll lane surface. The higher surface provides the following: a solid foundation for a tollbooth, canopy, and traffic control and toll related equipment, a platform for an attendant to service trucks, aesthetics enhancement by concealing conduit, and diverts drainage away from a tollbooth and any tunnel below the booth. Ramparts or crash blocks, either separately cast or monolithic with the toll island concrete, are used to protect the tollbooth, attendant and toll related equipment. Impact attenuators are frequently installed in front of the toll island to provide additional protection for the tollbooth and toll attendant. Attenuators are not intended to replace crash blocks, ramparts or other mass concrete structures.

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