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4.0 Geometric and Safety Design

4.5 Toll Island

The toll island, used for physical lane separation and protecting toll booth and toll collection equipment within the conventional plaza, is usually constructed of Portland cement concrete., It provides a foundation for the canopy and toll booth, conceals wireways and ductways, and protects and helps form access to either a tunnel or overhead walkway. In addition, the toll island provides the foundation for equipment used in lanes operating in manual and automatic collection modes. This equipment includes an automatic coin machine, an automatic ticket issuing machine, along with the associated traffic control equipment, including the island traffic signal, lane use signal, automatic barrier gate and display equipment such as the patron toll display, any changeable message sign and any speed display sign. Crash protection on the island approach end of a manual lane is provided to protect the attendant, toll booth and equipment, along with any stairs from either an overhead walkway or tunnel. The crash protection generally includes the following items, listed from the furthest to the closest to the tollbooth: crash cushion/impact attenuator, rampart, and crash block(s). Impact attenuators will not reduce the number of accidents, but rather the severity of an accident. The rampart and crash block(s) are intended to protect the attendant, toll booth and toll collection equipment.

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