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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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Presentation Transcript
a process for road layout

Road Design

A Process for Road Layout

slide3

Road Design

  • Check the existing Topographical data
slide4

Road Design

  • Decide on the type of road and characteristics
    • Freeway
    • Arterial
    • Collector
    • Feeder
slide5

Road Design

Setting up a chart for survey data and control points

slide6

Transit Line

Road Design

Setting up the 90° Intersection

slide7

Road Design

  • Plan the Start of the Curve (PC)
slide8

Road Design

Add information to the chart

slide9
Layout the Curve

Road Design

slide10

Road Design

Curve information

Knowns

R=300’

∆=33°34’

Now Calculate the Unknowns about the curve.

slide11

Road Design

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

slide13

Road Design

Convert 33°34’ to degrees

34’/60’=.567

33°34’ =33.567°

slide14

Road Design

Back to the Formula

L=175.756’

slide15

Road Design

Finding the angle of the 100’ chord (D)

Bisect the angle to create a Right Triangle

Inverse SinX=9.594°

D=2(9.594°)

D=19.1881°

D=19°11’

slide16

Road Design

Add information to the chart

slide17

Road Design

Continue laying out the road and points

slide18

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.

slide19

Road Design

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

slide20

Road Design

Vertical information is transferred back to the control points.

slide21
Freeway: A road with limited access that generally handles between 1,000-1,300 cars per hour per lane.
slide22
Arterial: Roads that carry between 400 to 800 cars per lane per hour depending on businesses,  parking, signs, and control signals.