Special Explication - What is it, where can we can it be found?
Special Explication (Maneuver Condition)
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Overview
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Special Explication is a navigation maneuver condition used to provide clear driving guidance at complex junctions where a standard instruction (e.g., 'continue straight') would be ambiguous.
Purpose
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The purpose of a Special Explication is to remove ambiguity in navigation instructions, provide explicit directional guidance (e.g., 'stay left' or 'stay right'), and improve driver confidence at decision points.
Definition
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A Special Explication is a two-link condition applied at decision points where more than one outgoing road is perceived as a valid continuation and standard maneuver instructions are insufficient.
Behavior in Navigation Systems
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When a Special Explication is present, the navigation system generates clear instructions such as 'stay right' or 'stay left', displayed visually and/or verbally.
When to Apply Special Explication
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- Controlled road access splits
- Multiple controlled-access branches
- Highway-to-Highway connectors
- Wide controlled-access expansions
When NOT to Apply Special Explication
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Do not apply Special Explication when the correct path is already obvious. Examples include low-speed road splits, toll structures, and clearly distinguishable motorway exits.
Key Considerations
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Use only when ambiguity exists, avoid overuse, and ensure consistency with surrounding maneuver logic.