Superelevation Design Process
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Questions and Answers

What is the relationship between P and W based on the equation P/W = (Sin θ + fCos θ)/(Cosθ - fSin θ)?

  • P is inversely proportional to W (correct)
  • P is directly proportional to W
  • P is quadratically related to W
  • P and W are equal

    • In the context of the equation v2/(g*R) = e + f, what does 'e' represent?

  • Pressure on inner tyres
  • Rate of superelevation (correct)
  • Normal force
  • Coefficient of lateral friction

    • If the coefficient of lateral friction 'f' is zero, what does 'e' represent in the equation v2/(g*R) = e + f?

  • Pressure on outer tyres
  • Equilibrium superelevation (correct)
  • Rate of super elevation
  • Coefficient of friction

    • Considering the equation P*(Cosθ - fSin θ) = W(Sin θ + f*Cos θ), which statement is true?

    <p>W is proportional to Sin θ + f*Cos θ</p> Signup and view all the answers

    Based on the equation P/W = v2/gR = (Tanθ + f)/(1 - fTan θ), what happens if 'f*Tanθ' is too small?

    <p>'v2/(g*R)' remains constant</p> Signup and view all the answers

    Why is superelevation typically provided on horizontal circular curves?

    <p>To counteract the centrifugal force and prevent skidding</p> Signup and view all the answers

    What is the purpose of providing extra widening on the inner side of a horizontal circular curve?

    <p>To assist trucks and trailers in off-tracking during low-speed maneuvers</p> Signup and view all the answers

    What is the effect of rigid wheel bases on the need for extra widening on horizontal curves?

    <p>It necessitates extra widening to accommodate the inner path taken by trailers</p> Signup and view all the answers

    Why do drivers tend to move towards the center line while negotiating a horizontal curve?

    <p>To enhance visibility and have a clearer view of the road ahead</p> Signup and view all the answers

    What factor counteracts the effect of superelevation on horizontal curves?

    <p>Rigid wheel base</p> Signup and view all the answers

    How does centrifugal force impact vehicle trajectory on horizontal circular curves?

    <p>It causes skidding and outward movement of vehicles on curves</p> Signup and view all the answers

    What is the purpose of eliminating the crown and rotating the pavement in the context of attaining superelevation?

    <p>To achieve positive camber throughout the width of the carriageway</p> Signup and view all the answers

    In the context of superelevation, what does 'tangent runoff distance' refer to?

    <p>The distance required to eliminate the negative camber on outer side</p> Signup and view all the answers

    What are the two methods discussed for eliminating the crown in the process of attaining superelevation?

    <p>Raising outer edge with respect to the center line and shifting crown towards outer edge</p> Signup and view all the answers

    Why is it important to attain full superelevation on a carriageway?

    <p>To achieve a better sight distance for drivers</p> Signup and view all the answers

    Which method involves rotating the pavement about the inner edge in order to attain superelevation?

    <p>Rotating about inner edge of the pavement</p> Signup and view all the answers

    What does 'shifting crown towards outer edge' aim to achieve in terms of superelevation?

    <p>Increase positive camber throughout the width of carriageway</p> Signup and view all the answers

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