For a maximum superelevation of 0.08 ft/ft and a degree of curve of 4o, calculate the maximum safe speed for the curve assuming that the sid

Question

For a maximum superelevation of 0.08 ft/ft and a degree of curve of 4o, calculate the maximum safe speed for the curve assuming that the side friction factor is 0.13. Using ADOT tables determine the maximum design speed. Comment on why the two values are different.

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Vodka 5 months 2021-08-31T10:54:58+00:00 1 Answers 4 views 0

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    2021-08-31T10:56:26+00:00

    Answer:

    Explanation:

    Given that

    Superelation= 0.08ft/ft

    Given curve= u•

    Curve junction factor= 0.13

    DR= 5729.57795

    R = 5729.57795/D

    R = 5729.57795/4

    R = 1432.4ft

    c + f = V^2/gG

    0.08 + 0.13 = V^2 / (32*1432.4)

    V^2 = 9625.728 or V = 98 ft/sec

    The designed speed for a project considered is a minimum value which means the highway design elements will meet or exceed the standards for the design speed. The maximum safe speed under normal condition is significantly greater than design speed

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