## Find Headlight And Intermediate Sight Distance-Mathematical Problem And Solution

Here, a mathematical problem is taken to determine the value of headlight sight distance and intermediate sight distance, when the value of the design speed is given.### Mathematical Problem

Find headlight sight distance and intermediate sight distance for a design speed of 65 Km/h (Use f=0.36, t=2.5 sec)

### Mathematical Solution

Design speed = 65 Km/h = 18 m/sec

= 18⨯2.5+ 18

**/(2⨯9.81⨯0.36) = 91m.**^{2}**Another way,**when design speed is taken as 65 Km/h

SSD = (0.278V.t + V²/254f)

= 0.278⨯65⨯2.5 + 65

**/254⨯0.36**^{2}
= 91m

so,

- Headlight Sight Distance(HSD) = SSD = 91m
- Intermediate Sight Distance(ISD) = 2(SSD) =2⨯91=182m

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