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The outcome of the spot speed studies carried out at a certain stretch of a highway are as follows. 50th percentile speed = 46 km/h ; 75th percentile speed = 54 km/h ; 85th percentile speed = 60 km/h ; 95th percentile speed = 75 km/h ; 98th percentile speed = 84 km/h ; 100th percentile speed = 95 km/h What is the speed (in km/h units) to be taken to check the geometric design elements.

The outcome of the spot speed studies carried out at a certain stretch of a highway are as follows. 50th percentile speed = 46 km/h ; 75th percentile speed = 54 km/h ; 85th percentile speed = 60 km/h ; 95th percentile speed = 75 km/h ; 98th percentile speed = 84 km/h ; 100th percentile speed = 95 km/h What is the speed (in km/h units) to be taken to check the geometric design elements. Correct Answer 84

Explanation:

The 98th percentile speed is adopted for the geometric design of highways.

[ alt="2017-08-03" src="https://storage.googleapis.com/tb-img/production/17/08/2017-08-03.png" style="height: 282px; width: 400px;">

Geometrical design speed = 98th percentile speed

Safe speed limit = 85th percentile speed

Minimum speed limit = 15th percentile speed

From the data given in the problem, 98th percentile speed = 84 km/h

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