For example , if the angle between the road and the uphill direction , projected onto the horizontal plane , is 60 ° , then the steepest slope along the road will be 20 % , which is 40 % times the cosine of 60 ° .
For example , if the angle between the road and the uphill direction , projected onto the horizontal plane , is 60 ° , then the steepest slope along the road will be 20 % which is 40 % times the cosine of 60 ° .