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For a two-lane pavement with radius of curve of 100 m, with design speed of 65 km/h & wheelbase of design vehicle of 6 m, the extra widening necessary will be 
  • a)
    1 m
  • b)
    1.5 m
  • c)
    2 m
  • d)
    2.5 m
Correct answer is option 'A'. Can you explain this answer?
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Calculation of Extra Widening Necessary for a Two-Lane Pavement

Given parameters:
- Radius of curve = 100 m
- Design speed = 65 km/h
- Design vehicle wheelbase = 6 m

1. Determine the Design Speed in m/s
- Convert the design speed from km/h to m/s
- 65 km/h = 18.06 m/s

2. Calculate the Design Speed and Wheelbase Factors
- Design speed factor (Kv) = 1.4 for 65 km/h
- Wheelbase factor (Kw) = 1.1 for 6 m

3. Compute the Extra Widening Necessary
- Extra widening necessary = (Kv * Kw * V^2) / R
- V = design speed in m/s
- R = radius of curve in meters
- Substituting the values:
Extra widening necessary = (1.4 * 1.1 * (18.06)^2) / 100
Extra widening necessary = 1.01 m

Answer:
Therefore, the extra widening necessary for the given parameters is 1 m.
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For a two-lane pavement with radius of curve of 100 m, with design speed of 65 km/h & wheelbase of design vehicle of 6 m, the extra widening necessary will bea)1 mb)1.5 mc)2 md)2.5 mCorrect answer is option 'A'. Can you explain this answer?
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