Design Project

I need you to write introduction and background. write about design number (3) in the green book. All the information that you need are in files.


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Department of Civil Engineering
CE 250
Dr. Mersky
Spring, 2018
20 Points
Design Project
A four-lane highway of design speed 55 MPH currently ends at sta.12 in the village of Northern
Babaganoosh. An extension is planned to connect Northern Babaganoosh with the central
business district of South Pita.
Your first assignment, as an employee of the firm of Salad Engineering (we’re so
environmentally aware that even our name is organic), is to design a curve connecting the
existing highway with the new South Pita Extension. Your design will include the horizontal
and vertical alignment of the connector. Your design must contain the following:
1. A report clearly showing:
Starting and ending stations of the horizontal curve
Horizontal curve center line offsets every 20 feet
Horizontal curve center line external distance
Normal crown on tangents
Lane and shoulder widths
Superelevation rate
Locations of all superelevation transition points (A-E)
Starting and ending stations of the vertical curve
Vertical elevations of the center line every 20 feet
Station and elevation of maximum vertical elevation
At least 2 CAD drawings.
Justification of all selected design values including:
Side friction factor
Length of horizontal curve
Length of vertical curve
Use or nonuse of transition spirals
2. An appendix with your calculations clearly organized and labeled.
Your design must consider:
AASHTO requirements, specifications and recommendations
Cultural and environmental impacts
Current events
Economic costs
The following information is available:
The existing highway approaches sta. 12 from the southwest at 210o counterclockwise from 0o.
The South Pita extension direction will be southeast at 30o clockwise from 0o. The existing
highway is horizontally tangent approaching sta.12. PI for the curve will be at sta. 12. Vertical
grade of the existing highway is +2o. The South Pita extension will have a grade of -3%. The
VPI of the grades occurs at the mid-station of the horizontal curve.
The Eggplant Rock Historic Site (marking the location of the first commercial farm in Northern
Babaganoosh) is centered 30 feet directly south of the inner edge of the current highway
terminus and 11 feet east of the existing highway edge. It is round with a diameter of 6 feet.
Rainfall infiltration within a distance of 2 feet from Eggplant Rock is an important aquifer
recharge. Any infiltration reduction of more than 30% would cause irrigation deficits. The
residential area of Northern Babaganoosh begins 60 feet directly north of sta. 12.
In the Spring, endangered Atlantic Condors migrate over Northern Babaganoosh as low as 160′
above mean sea level. While Atlantic Condors can avoid slow moving objects, they often cannot
avoid vehicles traveling above 50 MPH (which largely explains why they are endangered).
Surveying and construction costs for vertical curves are assumed to be $100.00/ft more than
construction costs of grade tangents. Surveying and construction costs for horizontal curves are
assumed to be $80.00/ft greater than construction costs for horizontal tangents. Excavation and
removal of soil for crest curves costs $2.00 per cubic foot.
Elevation at sta. 12 is 150’ above mean sea level.
Your design must be consistent with the 2001 Green Book.

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