Name : dimas adi praasetyoNpm : 1106127853

ROAD DESIGN STEPS

I. Collect Basic data

The basic data that we need is a topographic map of the area that we are building roads, natural geological maps, and map the existing road network. Of course we also need to know the budget for our road construction 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 to the 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 by development of traffic in the future, so our road can fulfill its function within a predetermined time

IV. Determine optimal road alignment

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

-horizontal alignment;we can determine the horizontal alignment based on our ; minimum radius of horizontal curvature, maximum road slope, maximum road visibility etc.

-vertical alignment;Vertical curves or grade changes, like horizontal curves, require proper consideration to minimize earthwork, cost, and erosion damage. Proper evaluation requires an analysis of vertical curve requirements based on traffic characteristics (flow and safety), vehicle geometry, and algebraic difference of intersecting grades. Vertical curves provide the transition between an incoming grade and an outgoing grade

-cross section;

and when we determine our alignment we need to consider making optimal alignment so we can make efficient road plan for our road budget, and efficient time needed for driver that will traverse our road.