111 What are the steps in designing and constructing a road

1.11 What are the steps in designing and constructing a road?

Solution

ROAD DESIGN STEPS

I. Collect Basic data

The basic data that we need is a topographic map of the area that we arebuilding roads, natural geological maps, and map the existing roadnetwork. Of course we also need to know the budget for our roadconstruction before we determine our roads

II. Identification location of the road

we identify the class of road that we will create, from the starting point tothe end point of our road construction plan

III. Determinate road criteria

We need to classificate our road based on the road function, vehicle plan,VLHR and VJR, and our design speed. Our road criteria is consider bydevelopment of traffic in the future, so our road can fulfill its functionwithin a predetermined time

IV. Determine optimal road alignment

We can determine our road alignment based on our basic data. Alignmenthave few type such as:-

horizontal alignment; we can determine the horizontal alignment based on our ; minimumradius of horizontal curvature, maximum road slope, maximum roadvisibility etc.-

vertical alignment; Vertical curves or grade changes, like horizontal curves, require properconsideration to minimize earthwork, cost, and erosion damage. Properevaluation requires an analysis of vertical curve requirements based ontraffic characteristics (flow and safety), vehicle geometry, and algebraicdifference of intersecting grades. Vertical curves provide the transitionbetween an incoming grade and an outgoing grade

cross section; and when we determine our alignment we need to consider makingoptimal alignment so we can make efficient road plan for our road budget,and efficient time needed for driver that will traverse our road