A driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 30 ft from the truck. If the driver was driving at 55 mi/h, how far was she from the truck when she first observed it (assume perception-reaction time is 1.5 seconds)? How far was she from the truck at the moment the brakes were applied (use a/g = 0.35)?
What will be an ideal response?
Use equation 3.35 to determine the stopping sight distance used.
Therefore, the distance from the point at which the driver observed the stopped truck to the truck is 30 + 409.37 = 439.37 ft.
Next, use equation 3.25 to determine braking distance.
Therefore, the distance from the point at which the driver applied the brakes to the truck is 30 + 288 = 318 ft.
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