Group 5 Flashcards
This should provide maximum efficiency in the traffic operation and maximum safety at a reasonable cost.
Answer: railway geometric design
This is steeper than the ruling gradient and can be overcome by a train because of the momentum it gathers while running on that section.
Answer: Momentum Gradient
Types of gradient: (4 pts)
Answers:
Ruling Gradient
Momentum Gradient
Pusher Gradient
Gradient at Stations
The section of a divided highway that separates the lanes in opposing directions.
Answer: Medians
Vertical aspect of the road, including crest and sage curves, and the straight grade lines connecting them.
Answer: Profile
Defined as a selected rate of travel used to determine the various geometric features of the roadway.
Answer: Design Speed
Vertical section of the ground and roadway at right angles to the centreline of the roadway, including all elements of a highway or street from the right-of-way line.
Answer: Cross Section
Refers to the geometric layout or configuration of a roadway or highway in the horizontal plane.
Answer: Horizontal Alignment
In what locations should we avoid making curvatures? Give atleast 3 locations. (3 points)
Answers:
-High fills or elevated structures
-At or near the peak in grade
-At or near a low point in a sag
-At the end of long tangents
-At or near intersections, transit stops, or points of ingress or egress
-At or near other decision points
Horizontal curves with less than 300 radii needs a?
Answer: Widening of Pavement/s
It refers to the arrangement of heights and depths of a road in terms of its vertical axis with respect to its horizontal alignment.
Answer: Vertical Alignment
Refers to the tilting of the road’s surface along the horizontal alignment.
Answer: Super elevation
2 Types of Tangent Grades: (2 points)
Answers: Ascending
Descending
Refers to the process of moving and reshaping the earth or soil to create the desired road alignment, profile, and grade.
Answer: Earthworks
