Table 4.11. Maximum Relative Gradients

Design Speed (mph)

Maximum Relative Gradient, G (%)

Equivalent Maximum Relative Slope

14

20

25

30

35

40

45

50

55

60

65

70

75

80

0.78

0.74

0.70

0.66

0.62

0.58

0.54

0.50

0.47

0.45

0.43

0.40

0.38

0.35

1:128

1:135

1:143

1:152

1:161

1:172

1:185

1:200

1:213

1:222

1:233

1:250

1:263

1:286