Set back distance for gate and engineering civil service with solved example

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Every point on highway adequate sight distance will be available on a horizontal curve. In the horizontal curve is a location which could be the problem of side distance so adequate sight distance must be installed on a horizontal curve for safe and efficient movement of traffic. See problem of Sight distance on a horizontal curve because of obstruction at the inner is of horizontal curve. Seeing the image due to some buildings we are not able to see line AB. We are only able to see line AC so this is the obstruction at the horizontal curve. 

Set back distance for gate and engineering civil service with solved example

Obstructions such as building trees, cutting slopes etc along the net are responsible. 

On a narrow Road TV side distance is measured along the centre line of the road and on wider Road decide distance is measured along the centre line of the inner side line. 

Setback distance depends on the value of the required side distance, radius of curvature and length of curve. 


Generally two case are considered for analysis of setback distance

Sight distance is less than the length of curve and 5 distance is greater than length of curve are the type by which we are going to drive the formula for the setback distance. 


Case 1 when side distance is greater than length of curve. 

In below image you have seen the the formula of calculation of setback distance

Set back distance for gate and engineering civil service with solved example

Riya denoting the value of Satvik distance by small m and it is calculated by this formula. This formula is useful narrow roads. 

Set back distance for gate and engineering civil service with solved example


For wider Road we are going to see another formula.

Set back distance for gate and engineering civil service with solved example

Case 2 when sight distance is greater than length of the curve.


Example


Calculate the required setback distance considering intermediate sight distance. 

Length of the curve 300 metre

Radius of horizontal curve 230 meter Design speed 80 kilometre per hour coefficient of friction 0.35 

Reaction time 2.5 second and total width of the payment of current 7.71m

( two Lane Road) 


Solution

example

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