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8 Factors Which Affecting Selection of Hill Road Alignment

Posted on 8th August 201822nd February 2022 By Malay Sautya

Contents

  • 1 Factors which Affecting Selection of Hill Road Alignment
    • 1.1 1. Length Of Road
    • 1.2 2. Loss Of Height
    • 1.3 3. Geometrical Standards
    • 1.4 4. Existing Saddle or Pass
    • 1.5 5. Drainage line
    • 1.6 6. Stability
    • 1.7 7. Altitude
    • 1.8 8. Cutting Through Rocks

Factors which Affecting Selection of Hill Road Alignment

The various factors which control the alignment of a road in hilly areas. Following are the 8 Factors which affecting selection of hill road alignment:

8 Factors Which Affecting Selection of Hill Road Alignment

1. Length Of Road

The cost of construction very much depends on the length of roads in hilly areas. The cost of construction of a hill road for each kilometer length is relatively high. hence, The alignment should be as short as possible so as to make the road project economical.

2. Loss Of Height

The alignment should not loose height. 

3. Geometrical Standards

The alignment should have proper geometrical standards such as gradients, curves, sight distance, the radius of curve etc. It should be free from sharp hair-pin bends.

4. Existing Saddle or Pass

The alignment should cross the series of hills through the existing saddle or pass.

5. Drainage line

The alignment should be parallel to the drainage line to avoid the construction of cross drainage structure.

6. Stability

The alignment should be provided along the side of a hill which is stable & not very steep. 

7. Altitude

If provide lower altitudes, the large numbers of cross drainage works are required to be constructed. Hence, the alignment should not be provided at very low altitudes so as to avoid large number of cross drainage works.

8. Cutting Through Rocks

The cutting of rocks is very expensive. As far as possible, The alignment should be avoid cutting through solids rocks.   Read More:

Read More:

Types of hill Roads

Components of a Hill Road

Highway engineering

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