NICET - Highway Construction Inspection Practice Exam

What is the percent cross-slope if the vertical distance is 0.96 feet?

1. 4%

2. 3%

3. 5%

4. 2%

The correct answer is: 4%

To determine the percent cross-slope, you need to use the formula for calculating percent slope, which is given by the formula: Percent Cross-Slope = (Vertical Rise / Horizontal Run) × 100% In this case, you've been given the vertical distance (the rise), which is 0.96 feet. However, to calculate the percent cross-slope accurately, you also need the horizontal distance (the run). The appropriate horizontal distance for typical cross-slope calculations, particularly in highway construction, is generally understood to be 24 feet, which is common for roadways. Using the typical horizontal run: Percent Cross-Slope = (Vertical Rise / Horizontal Run) × 100% = (0.96 feet / 24 feet) × 100% = 0.04 × 100% = 4% This results in a cross-slope of 4%. Therefore, the answer aligns exactly with the calculated percent cross-slope, confirming that the reasoning behind it is based on using the appropriate relationship between vertical rise and horizontal run. Understanding the application of this formula in context—particularly for roads or construction slopes—makes it clear how the slope impacts drainage and road safety.