31. The data given below pertain to the design of a flexible pavement.
    Initial trafic = 1213 cvpd
    Traffic growth rate = 8 percent per annum
    Design life = 12 years
    Vehicle damage factor = 2.5
    Distribution factor = 1.0
    The design traffic in terms of million standard axles (msa) to be catered would be
    

1. 1. 0.06 msa
      

   
   
   

   2. 8.40 msa
      

   
   
   

   3. 21.00 msa
      

   
   
   

   4. 32.26 msa

   
   
   

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1. View Hint View Answer Discuss in Forum

   Standard axle =	365 × A [ (1 + r)n - 1]	× F
   	r

   
   

   =	365 × 1213 [ (1 + 0.08)12 - 1]	× 2.5
   	0.08

   
   = 21.005 × 10⁶ ≈ 21 msa

   Correct Option: C

   Standard axle =	365 × A [ (1 + r)n - 1]	× F
   	r

   
   

   =	365 × 1213 [ (1 + 0.08)12 - 1]	× 2.5
   	0.08

   
   = 21.005 × 10⁶ ≈ 21 msa

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32. The design value of lateral friction coefficient on highway is
    

1. 1. 1.5
      

   
   
   

   2. 0.50
      

   
   
   

   3. 0.35
      

   
   
   

   4. 0.15

   
   
   

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1. View Hint View Answer Discuss in Forum

   As per IRC, Coeff of lateral friction = 0.15
   Coeff of longitudinal friction = 0.35 to 0.4

   Correct Option: D

   As per IRC, Coeff of lateral friction = 0.15
   Coeff of longitudinal friction = 0.35 to 0.4

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33. Design rate of super elevation for horizontal highway curve of radius 450 m for a mixed traffic condition, having a speed of 125 km/hour is
    

1. 1. 1.0
      

   
   
   

   2. 0.05
      

   
   
   

   3. 0.07
      

   
   
   

   4. 0.154

   
   
   

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1. View Hint View Answer Discuss in Forum

   For mixed traffic,
   

   e =	(0.75V)2	; V in m / s
   	gR

   
   Design speed = 125 kmph
   

   = 125 ×	5	= 34.7 m /s
   	18

   
   

   e =	(0.7V)2
   	gR

   
   

   =	(0.75 × 34.7)2	= 0.154
   	9.81 × 450

   
   

   Correct Option: D

   For mixed traffic,
   

   e =	(0.75V)2	; V in m / s
   	gR

   
   Design speed = 125 kmph
   

   = 125 ×	5	= 34.7 m /s
   	18

   
   

   e =	(0.7V)2
   	gR

   
   

   =	(0.75 × 34.7)2	= 0.154
   	9.81 × 450

   
   

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34. The ruling minimum radius of horizontal curve of a national highway in pljain terrain for a design speed of 100 km/hour with e = 0.07 and f = 0.15 is close to
    

1. 1. 250 m
      

   
   
   

   2. 360 m
      

   
   
   

   3. 36 m
      

   
   
   

   4. 300 m

   
   
   

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1. View Hint View Answer Discuss in Forum

   Design speed = 100 kmph
   

   = 100 ×	5	m/s = 28 m /s
   	18

   
   

   e + f =	v2
   	gR

   
   

   0.07 + 0.15 =	282
   	9.8 × R

   
   ∴ R ≈ 360 m

   Correct Option: B

   Design speed = 100 kmph
   

   = 100 ×	5	m/s = 28 m /s
   	18

   
   

   e + f =	v2
   	gR

   
   

   0.07 + 0.15 =	282
   	9.8 × R

   
   ∴ R ≈ 360 m

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35. Width of carriage way for a single lane is recommended to be
    

1. 1. 7.5 m
      

   
   
   

   2. 7.0 m
      

   
   
   

   3. 3.75 m
      

   
   
   

   4. 5.5 m

   
   
   

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1. View Hint View Answer Discuss in Forum

   Cland Carriage way	Width
   Single wad	3.75 m
   Multilane parement	3.5 m/lane
   Two lane (without raised Kerb)	7m
   Two lane (with raised kerb)	7.5 m
   Intermediate carriage way	5.5 m

   Correct Option: C

   Cland Carriage way	Width
   Single wad	3.75 m
   Multilane parement	3.5 m/lane
   Two lane (without raised Kerb)	7m
   Two lane (with raised kerb)	7.5 m
   Intermediate carriage way	5.5 m

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