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Forging new generations of engineers. Road Design. A Process for Road Layout. Road Design. Check the existing Topographical data. Road Design. Decide on the type of road and characteristics Freeway Arterial Collector Feeder. Road Design.

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A process for road layout

Road Design

A Process for Road Layout

Road Design

  • Check the existing Topographical data

Road Design

  • Decide on the type of road and characteristics

    • Freeway

    • Arterial

    • Collector

    • Feeder

Road Design

Setting up a chart for survey data and control points

Transit Line

Road Design

Setting up the 90° Intersection

Road Design

  • Plan the Start of the Curve (PC)

Road Design

Add information to the chart

Layout the Curve

Road Design

Road Design

Curve information




Now Calculate the Unknowns about the curve.

Road Design

To find the distance from P.C. to P.T. use the formula

Road Design

Convert 33°34’ to degrees


33°34’ =33.567°

Road Design

Back to the Formula


Road Design

Finding the angle of the 100’ chord (D)

Bisect the angle to create a Right Triangle

Inverse SinX=9.594°




Road Design

Add information to the chart

Road Design

Continue laying out the road and points

Road Design

To create the vertical profile of the road, lines are dropped from the station points and an exaggerated vertical scale is created. Elevation data from existing station points are plotted to a graph.

Road Design

A line is plotted through the points. The line is then smoothed and parabolic transitions are added between slopes.

Road Design

Vertical information is transferred back to the control points.

  • Freeway: A road with limited access that generally handles between 1,000-1,300 cars per hour per lane.

  • Arterial: Roads that carry between 400 to 800 cars per lane per hour depending on businesses,  parking, signs, and control signals.

  • Collectors: Local roads that can generally carry 100-250 cars per lane per hour.

  • Feeder: Local streets, Cul-de-sacs, or loops that service neighborhoods.