A section of highway has a superelevation of 0.05 and a curve with a radius of only 300 ft. What is the maximum safe speed at this section of the highway?
What will be an ideal response?
A trial value for u must be assumed and the corresponding fs found and then checked for safety. Using equation 3.34, solve for the value of fs associated with
u = 35 mi/h
R = u2 / 15(e + fs)
300 = 352 / 15(0.05 + fs)
fs = 0.22
Interpolating in Table 3.3, for u = 35 mi/h, fs = 0.18 should be assumed. Therefore, try a lower speed of u = 30 mi/h. Using Equation 3.34, fs = 0.15, which is less than the assumed to be provided value of 0.20. Therefore, the maximum safe speed at this section of the highway should be 30 mi/h.
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