What geometrical characteristic do the entry and exit curves of a traffic rotary possess_______________?
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Answer: D. different radii and different widths of pavement
Explanation
Entry and exit curves of a traffic rotary feature different radii and pavement widths for smooth weaving. Varying geometric properties help control vehicle entry speeds and facilitate safe weaving maneuvers. Exit curves are typically wider and have larger radii to allow vehicles to accelerate smoothly away. Traffic rotaries or roundabouts use central islands and weaving sections to eliminate severe crossing conflict points. Entry curves force motorists to slow down and yield to circulating traffic streams already within the rotary. Geometric design guidelines specify appropriate radii and weaving length parameters for efficient roundabout operations.
Traffic engineers design roundabout geometry to balance safety, capacity, and heavy vehicle off-tracking needs. Properly designed entry and exit curves reduce intersection accident severity compared to traditional traffic signals. Urban roundabouts manage complex multi-leg intersection turning movements efficiently without signal delays. Equal radii and pavement widths fail to provide necessary speed reduction and weaving guidance at rotaries. Having equal radii with varying widths ignores standard asymmetric design principles required for safe entry transitions. Keeping pavement widths equal while varying only radii neglects established guidelines for rotary weaving geometry.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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