Repeat Problem 7-12 for a one-lane, one-way operation with provision for passing a stalled vehicle.
What will be an ideal response?
The first step is to determine the minimum radius of curvature for the
ramp, using Equation 3.34. Coefficient of side friction can be seen in Table 3.3:
R = u2 / 15(e + fs)
R = (30)2/15(0.08 + 0.20)
R = 214.29 ft
From Table 7.5, determine appropriate pavement width, W, knowing that:
a. Operational requirements: Case II – one-lane, one-way operation, with
provision for passing a stalled vehicle
b. Traffic conditions: Type B – SU is the design vehicle
c. Edge of pavement treatment: Stabilized shoulder
From Table 7.5, deduct shoulder width when stabilized shoulder is
present. The minimum pavement width is the width under Case I which was
found to be 15 ft in Problem 7-12. While the width of the stabilized shoulder is
not given, it is known that the stabilized shoulder is on both sides, therefore it is
reasonable to assume that the total width of stabilized shoulder is at least 5 ft.
Deducting this from W = 20 ft gives a new answer of W = 15 ft.
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