Solve using the equation and notes in the second jpeg please, in ft Braking DistanceGeneral Equation (D: unit in feet):D₂u²30(f±G)where,G = Grade; f = Friction Coefficient; u = speed (mph)Deceleration rate:f=;where, a = Deceleration rategu²30+Gg■ AASHTO Recommendation, a = 11.2 ft/sec², g = 32.2 ft/sec²Panic stop≈ 14.8 ft/sec²D₂ = ExampleA motorist is traveling at 65mph intends to leave expresswayusing an exit ramp with a maximum speed of 35mph. At whatpoint on the expressway should the motorist step on herbrakes in order to reduce her speed to the maximum allowablespeed on the ramp before entering the ramp, if this section ofexpressway has downgrade of 3%?

Given, u1= 65mph u2 = 35mph G= 3%(downgrade)

Braking Distance □ General Equation (D: unit in feet): D u² 30(f±G) where, G=Grade; f = Friction Coefficient; u = speed (mph) Deceleration rate: =;where, a = Deceleration rate g u² D₂ = - 30 -±G g ■ AASHTO Recommendation, a = 11.2 ft/sec², g = 32.2 ft/sec² □ Panic stop≈ 14.8 ft/sec²

Braking Distance □ General Equation (D: unit in feet): D u² 30(f±G) where, G=Grade; f = Friction Coefficient; u = speed (mph) Deceleration rate: =;where, a = Deceleration rate g u² D₂ = - 30 -±G g ■ AASHTO Recommendation, a = 11.2 ft/sec², g = 32.2 ft/sec² □ Panic stop≈ 14.8 ft/sec²

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 23P

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