Standard

DDS 219 Route Location and Design

Course Description

Provides the fundamentals of proper highway design. Students have opportunities to participate in actual field stakeout, measurement, and solution of design problems given specific parameters. Topics include: land transportation systems; ground and aerial route survey methods; circular, compound, reverse, and parabolic curves and spirals; highway design safety and limitations; intersections and interchanges; plot and field stakeout; and topographic planning.

Competency Areas	Hours
Land Transportation Systems	Class	4
Ground and Aerial Route Survey Methods	D. Lab	6
Circular, Compound, Reverse, and Parabolic Curves and Spirals	P. Lab/O.B.I.	0
Highway Design Safety and Limitations	Credit	7
Intersections and Interchanges
Plot and Field Stakeout
Topographic Planning

Prerequisite/ Corequisite:

DDS 218

Course Guide

Competency	After completing this section, the student will:	Hours
		Class	D.Lab	P.Lab/ O.B.I.
LAND TRANSPORTATION SYSTEMS		5	0	0
Introduction	Describe the following: the national interstate and defense highway system, the federal highway system, state highway systems, county and local road systems, and city street systems.
	Describe highways in terms of partial or full control.
	Identify professional associations concerned with highway design.
Highway planning	Discuss urban and rural theories of highway planning.
	Discuss economic, social, and environmental factors affecting highway location and design.
GROUND AND AERIAL ROUTE SURVEY METHODS		8	8	0
Ground survey methods	List the primary products of the preliminary reconnaissance survey, the reconnaissance survey of selected routes, and the location survey.
	Describe how horizontal and vertical control is achieved on route surveys.
	Stakeout a route centerline using the transit-tape method.
Aerial survey methods	Describe how photogrammetric mapping facilitates location selection.
	Identify how mosaic photographs, continuous strip photographs, and oblique photographs are used in route selection.
CIRCULAR, COMPOUND, REVERSE, AND PARABOLIC CURVES AND SPIRALS		8	8	0
Circular curves	Identify on a circular curve: point of curve, point of tangent, point of intersection, vertex, long chord, tangent distance, middle ordinate, and external distance.
	Express curve sharpness by radius degree of curve--arc basis, and degree of curve--cord basis.
	Solve curve computations for length of curve.
	Calculate curve stakeout data for deflection angles.
	Stakeout a circular curve using deflection angles. At least one transit setup should be on the curve.
Parabolic (vertical) curves	Given both intersecting grades and the maximum allowable change in grade per station, compute the elevation of the final grade at each station on the vertical curve.
	Stakeout a vertical curve.
Spiral curves	Calculate superelevation given the design speed of the highway.
	Given the central angle, degree of curvature, length of the spiral (300' minimum), compute stakeout data for a spiral (easement) curve.
HIGHWAY DESIGN SAFETY AND LIMITATIONS		4	0	0
Highway design safety and limitations	Describe specification for: lane width, pavement thickness, sight distance, shoulder construction, signage, drainage, turn radius, and maximum grade.
INTERSECTIONS AND INTERCHANGES		5	0	0
Simple intersections	Describe plain, flared, and channelized intersections.
	Describe T and Y intersections with grade separation.
Complex intersections	Describe traffic circles and their advantages and disadvantages.
	Describe the diamond interchange.
	Describe the split-diamond interchange.
	Describe cloverleaf intersections.
	Describe directional interchanges.
PLOT AND FIELD STAKEOUT		4	30	0
Plot and field stakeout	Given topographic data for a tract of land and all design data, stakeout the centerline, and horizontal and vertical curves and slopes required to complete a road.
TOPOGRAPHIC PLANNING		6	14	0
Data collection	Make a preliminary survey to include horizontal curves and topographic data.
	Record data appropriately in the field book.
	Identify the items located in the proposed right of way on which topographic data should be collected.
Design work	Design proposed roadway segment integrating topographic data in alignment and profile drawings, cross sections plotted, grades and volumes determined, and other considerations such as drainage, etc.
	Discuss right of way and construction considerations related to topographic data collected in planning and design phases.

Suggested Resources

Books

American Association of State Highway & Transportation Officials. (1981). Guide for accommodating utilities within highway right-of-way. Washington, DC: Author.

American Congress on Surveying and Mapping. (Year). Measuring practice on the building site. Falls Church, VA: Author.

Barnes, W. M. (1988). Basic surveying. Stoneham, MA: Butterworth-Heinemann.

Brinker, R. C., & Wolf, P. (1984). Elementary surveying. New York: Harper & Row.

Kavanagh, B. F. (1988). Surveying: With construction applications. Englewood Cliffs, NJ: Prentice Hall.

Mumford, L. (1989). Highway sight distance design issues. Washington, DC: Transportation Research Board.

Ross, S. S. (1989). Highway design reference guide. New York: McGraw-Hill.

Ross, S. S. (1989). Human performance & highway visibility: Design, safety, & methods. Washington, DC: Transportation Research Board.

Stull, P. (1987). Construction surveying & layout. Carlsbad, CA: Craftsman.

Whyte, W. S., & Paul, R. E. (1985). Basic metric surveying. Stoneham, MA: Butterworth-Heinemann.

Wilson, A. L. (1982). Elementary forest surveying & mapping, two. Corvallis, OR: Oregon State University.

Wilson, R. L. (1985). Elementary forest surveying & mapping, no. one. Corvallis, OR: Oregon State University.