For mixed traffic conditions, rate of superelevation for horizontal highway curve of radius 500 m and a speed of 100 kmph is

This question was previously asked in

KPSC AE 2017: Specific Paper

Option 2 : 0.089

ST 1: Building Material and Concrete Technology

18752

20 Questions
20 Marks
12 Mins

**Concept:**

In mixed traffic, different vehicles move at different speeds.

For practical conditions, IRC recommends that superelevation should be provided to fully counteract the centrifugal force due to **75 % of design speed** by **neglecting lateral friction**.

We know

\(e + f = \frac{{{v^2}}}{{g \times R}}\)

f = 0, g = 9.81 m/s^{2}, v in m/s

\(v\;\left( {\;kmph} \right) = \frac{5}{{18}} \times v\;\left( {m/s} \right)\)

\(e=(0.75×v)^2/(g×R)\)

\(e = \frac{{{V^2}}}{{225 \times R}}\) Where V in (kmph), R in (m)

**Calculation:**

Given,

V = 100 kmph, R = 500 m

\(e = \frac{{{{\left( {100} \right)}^2}}}{{225 \times 500}}\)

**e = 0.0889**