## 1. A horizontal curve with a radius of 800ft connects the tangents of a two-lane highway with a design superelevation of 0.06 and a coeffici

Question

1. A horizontal curve with a radius of 800ft connects the tangents of a two-lane highway with a design superelevation of 0.06 and a coefficient of side friction of 0.14. Lanes are to be 12-feet wide and there is no median. Please calculate: a) What is the speed limit to be posted for a vehicle traversing this curve

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5 months 2021-08-14T15:53:53+00:00 2 Answers 2 views 0

vmax=72.59m/s

Explanation:

To solve this problem we use

where R is the radius of the curve, g is the gravity constant, α is the degree of superelevation, ff is the friction coefficient. By replacing we have

where we have taken into account that R=800+6 due to the 12-feet of the Lanes, but we take one half, because we assume the car is at the center of the Lane.

I hope this is useful for you

regards

2. Answer: V = 72.05 ft/s

Explanation: Please find the attached file for the solution

Ignore the first file.