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4.0 Geometric and Safety Design

4.1 Approach Zones

The approach zone of a conventional plaza design is the area in advance of the toll plaza. It includes a transition area where the pavement widens at a specified taper rate from either the mainline roadway section to the width of the conventional plaza toll lanes, plus a queue zone with no taper prior to the front edge of the toll islands (see Figure 3 in the Glossary). If the toll plaza has express lanes, the approach transition zone extends from the start of the gore area where the conventional plaza lanes diverge from the express lanes.

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