1. The first stage of road construction and transportation operations In the most basic stage of road construction operations, the transportation or road construction engineer must prepare a topographic map that includes the physical characteristics of the land for the road area. This topographic map must have elevation curves. Also, at this stage of the road construction operation, the characteristics of the land on which the road is to be built should be determined. The type of land for road construction can be plain, mountainous or horizontal hill. In the next step, the specifications of the road, such as the number of lanes on the way back and forth, etc., must be determined. Also, at this stage, the design speed and the minimum and maximum virtual slope that this road can have are determined by the road construction engineers.

2. The second stage of road construction and transportation operations: road filling should be done in this stage of road construction operations. In the initial step of this step, you should calculate the appropriate radius according to the value you obtained in the previous step and from the value of the slope. In the next step, the engineers of the road construction project, from the beginning of the road to the end of the road, should draw circles with the calculated radius, so as to cover the entire route in the transportation operation.

3. The third stage of transportation and road construction operations The third stage is one of the most important stages in road construction operations. In the third step, broken lines should be defined. To specify these broken lines on the road, you need to pay attention to certain things. Among the things that you should pay attention to at this stage of the transportation operation, is that the road designed by you should have the minimum number of breaks and curves. Also, the angle that deviates the path must be its minimum value. With all these things in mind, you need to determine the location of the broken lines. Also design the vertical arcs of the path. If you pay attention to the mentioned points, you can design optimal broken lines in transportation operations.

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