Obligatory Points in Highway Alignment : With 2 Types

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A. What are Obligatory Points?

Obligatory Points refer to the control points that govern highway alignment. These points govern where the alignment should pass and where the alignment should not pass.



B. Types of Obligatory Points.

The obligatory points are classified into two types.


1. Positive Obligatory Points:

Positive obligatory points are those points through which the alignment should pass.

a. Existing Road:

The newly constructed road should align and link with the existing road. It decreases the cost of construction.


b. Intermediate Town:

If there is the possibility of a straight road between points A and B and there lies an intermediate town at C, as shown, then the road needs to link the intermediate town, reducing the change in highway alignment.

Positive Obligatory Points:


c. Bridge site/Existing Bridge:

Obligatory Points

The road connecting with the bridge must not be curved.

The road alignment should cut the river at 90 Degrees, identical to the Railway lane.


d. Mountain:

Positive Obligatory Points:

If the alignment passes through the Mountain, looking at the best options, either building the tunnel or reaching around the hills, is instructed.

A mountain pass may be a good option when the road needs to cross a row of hills.

The option selection relies on topography, site conditions, and construction and operation costs.



Read Also:

Low Cost Road Construction: A Comprehensive Guide to 4 Types, Characteristics, Advantages, and Disadvantages


2. Negative Obligatory Points: 

Negative Obligatory Points refers to points through which the alignment should not pass.

Negative Obligatory Points

i. Valleys, ponds, and marshy land should be avoided as far as possible.

ii. Religious places are connected with human sentiment, so they cannot be destroyed to correct the road alignment.

iii. Costly structures present in the way of alignment should be viewed, and the road alignment should be specified so that it won’t destroy those costly structures, as the compensation value for such structures will be higher.

iv. Conservation areas and restricted zones.

v. Densely populated area.

vi. The road should not be within the border of the country.


Verified Article By Er. Madhu Krishna Poudel
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