Highway geometry, traffic flow, level of service, pavement design, leveling, traverses, curves and earthwork volumes.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What does horizontal alignment describe?
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The positioning of the road in the horizontal plane, including curves and straightaways.- What does vertical alignment describe?
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The positioning of the road in the vertical plane, including grades and vertical curves.- What is superelevation?
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The tilting of the pavement on curves to help shed water and counteract centrifugal force.- What is sight distance in highway design?
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The length of road visible to a driver under specific conditions.- Define stopping sight distance (SSD).
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The distance needed for a driver to perceive, react, and bring the vehicle to a complete stop.- What is passing sight distance?
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The minimum sight distance needed to safely pass a vehicle on a two-lane road.- Why are spiral curves used in highway design?
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To provide a gradual transition from straight alignment to circular curve, avoiding abrupt changes in centripetal acceleration.- What is a crest vertical curve?
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A vertical curve that is convex upward, arching over the top of a hill.- What is a sag vertical curve?
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A vertical curve that is concave upward, dipping into a valley.- In highway design, what is grade?
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The slope or percent change in elevation along the road.- How are horizontal curve radius and vehicle speed related?
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As speed increases, a larger radius is required to maintain safe operation.- What is an intersection angle in curve design?
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The angle between two straight segments (tangents) connected by a curve.- What does a horizontal curve's degree of curvature indicate?
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The sharpness of the curve; a higher degree indicates a sharper (tighter) curve.- Define traffic density.
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The number of vehicles per unit length of roadway at a given moment.- What is traffic flow (or volume)?
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The number of vehicles passing a point per unit time.
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