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Cross Slope Calculator

Formula

The formula to calculate the cross slope is:

$\text{CS} = \frac{\text{E}}{\text{W}} \times 100$

Where:

$\text{CS}$ is the Cross Slope (%)
$\text{E}$ is the difference in elevation between edges (ft)
$\text{W}$ is the lane width (ft)

What is Cross Slope?

Cross slope refers to the slope of the road surface perpendicular to the direction of travel. It is typically used to facilitate drainage and improve road safety by preventing water accumulation on the road surface.

Example Calculation 1

Let's assume the following values:

Difference in Elevation = 0.5 ft
Lane Width = 12 ft

Using the formula:

$\text{CS} = \frac{0.5}{12} \times 100 \approx 4.17\%$

The cross slope is approximately 4.17%.

Example Calculation 2

Let's assume the following values:

Difference in Elevation = 1 ft
Lane Width = 10 ft

Using the formula:

$\text{CS} = \frac{1}{10} \times 100 = 10\%$

The cross slope is 10%.