A two-lane road crosses an at-grade railroad track at 90°. If the design speed of the two-lane road is 45 mi/hr and the velocity of the train when crossing the highway is 80 mi/hr, determine the sight distance leg along the railroad tracks to permit a vehicle traveling at the design speed to safely cross the tracks when a train is observed at a distance equal to the sight distance leg.
What will be an ideal response?
Use Equation 7.9 to calculate the required sight distance leg along the railroad tracks.
dT = 80 / 45 [1.47(45)(2.5) + ((45)2 / (30)(0.35)) + 2(15) + 65 + 5]
dT = 814.63 ft
Therefore, the sight distance leg to be provided along the railroad tracks is 815 ft.
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