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Drafting Exam 2

QuestionAnswer
horizontal alignment defines the position and direction of a route on a horizontal plane, or plan view. It explains the horizontal curves in a road as seen on a site plan
stationing locates station points every 100 feet from the beginning of the project
full station 100 feet
plus station specifies a point between full stations
horizontal curve a geometric feature that occurs when a route changes direction or alignment
Simple = Circular an arc of a circle with a constant radius. The larger the radius of the curve is, the gentler the curve will be. A simple curve is usually tangent to straight lines and is generally the most common type of curve
compound curve includes two simple curves with different radii joined together and curving in the same direction. Compound curves are used whenever it is necessary to change the radius of a curve, such as curving around obstacles, boundaries, or changes in terrain
reverse curve includes two simple curves with the same or different radii joined together and curving in opposite directions. Reverse curves are used whenever it is necessary to reverse the direction of an alignment
spiral curve a curve defined by a constantly changing radius. Creates a smooth transition between simple curves and used in highway design and railways
I intersection angle
PI Point of intersection
PC Point of curvature
PT Degree of curve
Created by: jstillion0404
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